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The Glass House [Yandere Mahito x Reader]

Title: The Glass House [Yandere Mahito x Reader]

Synopsis: You get your period and Mahito wants to run a few tests.

Word count: 3465

notes: yandere, consensual relationship, reader is on their period, mentions of other people's torture and death, humiliation relating to period, Mahito being Mahito is his own warning

It’s not often that Mahito bothers with your bathroom. Only, in the past, when you’ve been in it--naked and wet and usually mid-shower, as he apparently finds it entertaining to see what noises you make each time he surprises you. 

(Once, after comparing him to the killer in Psycho, he’d demanded to then watch the film. ‘But I didn’t stab you and you didn’t bleed chocolate syrup,’ he’d said, simply, after the scene in question.)

Today, though, he’s decided that there must be something interesting in there, because he’s spent the better part of 5 minutes rummaging--you can hear the sound of items being moved--in the closet and, judging by the sound of rustling, he’s now fiddling with the trash can.

“Hey,” he says, finally sauntering out of the bathroom. When you turn to greet him, a sarcastic remark about having fun digging through the trash on your lips, your heart stutters. 

In return, Mahito simply blinks at you.

“What’s this?” He asks, dangling one of your used pads from his hand.

The smear of dried blood in the center of the white pad feels accusatory, out of its proper context in the trash can. A bit of toilet paper sticks to the end of it, remnants of the ball you created to cover up your mess. 

“Oh fuck,” you say, reflexively. “Put that down! That’s--it’s--”

“It’s blood,” he says, giving the pad a sniff. “Smells funny though. Why’s it in your bathroom? Why’s it on this thing? When did you get hurt? Why were you hiding it in the trash?” The questions come simply, nearly rapid-fire. He probably says them as he thinks them.

Your cheeks burn something awful by the end of his questions, and your answer comes out half-stuttered. “It’s--I didn’t get hurt. I’m on my period.” 

One of his fingers is stuck to the bottom of the pad, and he peels it off deftly, holding it closer as you wish you could snatch it from his hands and forget this ever happened.

“Oh,” is what he says, eventually, with a quiet hint of curiosity. “I guess I’m lucky then. I’ve been wanting to study human menstruation for a while now.”

The word study sticks to your chest, but you aren’t able to peel it away so easily. You don’t want him to study you; don’t want to be under his scrutiny in such an obvious way. It’s easier to pretend he knows about people, about humanity, when you’re firmly playing at something closer to a normal relationship.

As if anything about this was normal. 

“Can’t you study one of your… experiments?” 

Experiments. Oh, what a simple, inoffensive word for what they really are--you shake that thought away as easily as a mosquito, though it never truly leaves the room. 

At this, Mahito’s eyebrows raise, and the edge of a smile tickles his lips. 

“Oh,” he coos. “That’s awfully selfish to say, even for you.”

He closes the distance between the two of you now, and you don’t bother resisting when he gives your chest a poke--thankfully with the hand not currently holding your used pad--and encourages you to sit back down on the sofa.

“I want to see.” Simple and clear, like most of the things he says to you. His directness with you is something that does make him stand apart from most people. If he wanted attention, he told you so; if he wanted to be left alone, the same. There weren’t mind games with him or--or hell, if there were mind games, you were too stupid to notice them and that was just fine with you, because the alternatives of your past relationships had been far worse. 

“Why?” You ask, if only to delay the inevitable.

Mahito shakes the pad on his hand, smiling a little at the way it sticks, before he peels it off and sets it on the coffee table. He sighs. “Movies never show it. They always show the woman eating ice cream or screaming at her boyfriend or cuddling with pillows, but they never show what’s actually happening down there.”

You squirm without moving.

“It’s just blood.” Your tone stays flat, uninterested. If he thinks it’s boring, he might move on. “Nothing special about that.”

Mahito’s smile reminds you of an eel. 

“Then show me.” 

It’s not a request that you can parry off, so you don’t bother; instead, you spread your legs, pulling up your skirt so that Mahito won’t do it himself. You might just lose the garment entirely, if it was left up to him.

Mahito claps, then crouches down in front of you, getting far too close to your pad-clad underwear for comfort. He takes a sniff and you’d like to die on the spot.

He gives the pad a poke. 

“Why do you put this in there? What’s it called again?”

You close your legs a little--instinct--and he holds them open for you. It’s easier that way, you think. Easier when he takes control and you don’t have to fight your instincts. 

“It’s a pad,” you force out. “I put it there to absorb the blood.”

He tilts his head. “Why?”

Your nose wrinkles at the question. “So it doesn’t get on my clothes or everything I sit on.” A ghost of a memory pushes through your brain--blood stains on school bus seats and church pews--and you force it down.

Mahito tilts his head, and you think he’s about to ask what you’re thinking about, but instead he sighs and rests his head against the edge of your thigh.

“Humans are so squeamish.” His fingers reach up and climb up your leg, dancing on your inner thighs, towards the pad. You twitch--it tickles--and he smiles. “Does everyone use pads?” 

“No,” you say, as he grips the top of your underwear and begins to slide them down. You do move, now, but not to oppose him. It would be pointless. Instead you hike yourself up a little, so that your bare privates aren’t touching the couch. “Some people use tampons,” you finish, as if you’re not sitting here, hunched on your sofa, while a curse pulls down your underwear to get a look at what’s underneath.

Mahito glances up at you. He wants you to elaborate.

“A tampon is like a cotton stick, I guess? You put it up--there--and it absorbs like a pad. But from the inside.”

“Oh!” The edge of Mahito’s fingers play with the pad on your underwear. “I guess some of my experiments have been on their period, then. I wondered what those were.” He pouts, just a bit. “Maybe that’s why some of my experiments haven’t been working out right. I wasn’t taking menstruation into account.”

The thought has your stomach roiling. But you don’t want to talk about it. Don’t want to think about it--what Mahito does, when he’s not here, and how what he does is just as much a part of him as the moments when he’s snuggling with you in your apartment or fucking you into your mattress.

When you look back at him, he’s grinning.

“You’re squeamish, too. About my work.” He presses a kiss to the inside of your knee. “Don’t worry. It’s cute on you.”

With that, he gives up all pretense, and peels the pad away from your underwear in one swift motion.

“What are you doing?” You ask, even though you know the answer.

“Keeping it.” He sets it next to the already used pad. In contrast, the pad he’s just peeled away still has mostly brighter red blood on it, rather than the dull, brown old blood from the bathroom trash can. “I want to see how long it takes for you to bleed through your underwear. And some more things,” he adds, casually.

Oh, you think. This is too far, too weird. It’s puncturing the bubble you’ve created around you and Mahito in a way you don’t like.

“Mahito, I am not--”

In an instant, his eyes are on you. It’s a look that says, “You are,” and your lips feel like they clamp shut without hesitation. Something low climbs into your stomach and takes root there. When your shoulders slump, defeated, he pats your knee in appreciation.

“We’ll have a slumber party this week,” he tells you, voice getting more giddy as he goes on. “For three days? Four? However long you bleed.” He stands up and begins to survey your apartment, but for what you don’t yet know. “I can get a lot of experiments done in four days.” 

You don’t have the heart--or the stomach--to deny him.

--

When you were thirteen, you once got your period in the middle of class. You didn’t know it until you leaned forward in your desk to get a closer look at what the teacher wrote on the blackboard--your needed glasses at the time, and didn’t yet know it--and one of the boys behind you let out a distinct tween boy guffaw, snickering just loud enough for everyone to hear: “Dude, that’s fucking nasty.”

And then you’d felt it--wetness clinging to the inside of your black pants. And you’d scooted back, looked between your legs, and there it was: a smear of red on the dull grey chair. 

You were too embarrassed to do anything but sit back down, cheeks so hot that you began to sweat, and listened as everyone behind you began murmuring about your period. You had wanted to die for almost two weeks, and for the rest of your school career, you wore a sweater around your waist just in case you started without warning. 

That incident, as life-defining as it had been, was not as embarrassing as what you’re going through right now.

“Mahito,” you mumble, voice thick from your tightened throat. “Is this really necessary?”

Mahito, seated at a folding table he’s hauled into the living room, glances up at you. You, naked as the day you were born and perched awkwardly on top of a porcelain bowl that Mahito had shoved underneath you.

“Which part? The bowl or you being naked?”

“Both,” you blurt helplessly.

Mahito smiles. It’s such a pretty, awful little smile. “The bowl is,” he admits. His eyes leer over your body, awkward as it must look right now. “I just like to look at you.”

God help you, you feel flattered; the warm flush in your skin tingles with the new emotion. Mahito’s praises never failed to make you feel like that, even in the midst of something like this.

Mahito abandons the table and squats in front of the sofa, peering in between your spread thighs at the bowl underneath. You squirm, and he smacks the inside of your thigh sharply. You stop moving.

“I thought it would come out faster.” His tone is soft, low. Detached to everything but mild curiosity. Like a child studying an insect in a chair. “But it’s more… oozing than anything.”

“Don’t call it oozing,” you say. 

Before he can answer, a timer resting on the folding table dings delightfully. Mahito doesn’t waste time and yanks the bowl out from underneath you, leaving you to land flat on the sofa with your bare ass.

“’Hito!” You whine. “It’ll stain!” Thoughts of having to get the smeary blood out of your couch override the desire to keep your whining to a minimum, lest Mahito get annoyed with you. But, you think, it doesn’t matter much now. He’s not even paying attention.

Instead, he whisks the bowl over to the table and places it on the scale to weigh.

He sighs out something like disappointment. “It’s not that much blood at all, really. I don’t know why women complain about it so much in movies.”

He wasn’t paying attention to your whining earlier, but he does hear your incredulous intake of breath at his words. He glances back at you, confusion written on his face.

“What? It really isn’t. Now, when someone loses a limb, that’s real blood loss. And it spurts out, instead of oozing.” He nods, affirming his thoughts to himself. “That would be something to complain about.” 

“It’s not just the blood,” you say, half absent. Your mind drifts to when and where and how Mahito might see someone lose an arm. Did he cut it off? Or another curse? Did the blood droplets spray over his face? Did the person die right away or--

While you were lost in thought, Mahito left his post at the table and returned to crouch in front of you, now sitting flat on the sofa despite the inevitable stains. 

“Go on,” he says simply, all the while pushing your thighs apart with his hands. There’s a bit of blood smeared on the inside of your thighs and he leans forward to give it a lick. The awful feeling nesting in your stomach bristles. 

“Don’t.” 

Mahito blinks up at you. “I want to,” is all he says, before he does it again. 

The look he gives you--Will you try to stop me?--is met with you dropping your chin, just in time to see him smile. He gives another lick. “Tell me what else makes you complain when you’re on your period.”

You think about the sneering boys behind you at school, the way one of them tapped you on your shoulder and said, voice full of glorified condescension, “Aren’t you even wearing a pad? That’s nasty.” 

Instead, you rest your hands on your naked stomach and murmur out the answers Mahito wants to hear.

“Cramps.” You swallow, forcing yourself to taste the ghost of your milkshake from lunch this afternoon and not the bile that wants to come up. “From the um, uterus contracting. It can hurt really bad.” 

One of the girls in the class discretely handed you a pad, but your embarrassment had been so awful that you pretended not to see her, even when she waved it in front of you. “What a bitch,” she’d murmured to a friend afterward. 

“Back pain,” you continue, voice cracking. “And you can get tired. You want to eat but can’t… or you don’t want to eat at all, sometimes. It’s just… a lot of stuff.”

Your body jolts when Mahito puts his hands on your stomach--he wouldn’t transfigure you, he’s said that, and you remember his words well. But it doesn’t stop you from imagining.

“Is that why women get angry when they menstruate?” The mild glare you give him is met with the most innocent of expressions. “What? It’s what all the movies say. Though the man usually gets hit with something after he says it.” He smiles, as if daring you to hit him. You don’t.

Instead, you keep talking. Maybe it’s a way to ground yourself. Maybe you just want to talk to fill the space where dead, disfigured women, corpses created at Mahito’s whim, exist.

“Your hormones can fluctuate.” You smile a little at the forced nostalgia. “Sometimes I get really upset over dumb things. Especially when I was younger. One time, I sobbed because my mom said she was going to get fast food for dinner and she changed her mind.”

Mahito rests his elbows on your thighs, digging into them harshly. His hair tickles your skin, and you wonder, idly, if he’ll get your blood on the silver strands.

“Do you want to cry now?” He asks, almost sweetly. “I wouldn’t mind.”

Do you want to cry? No. You might, though, if things keep going the way they are. So you dig your teeth into your lip and shake your head.

“No. This is just… embarrassing, I guess.” To be naked. To be bleeding. To have Mahito sitting there, your blood on his tongue.

Mahito quirks his head, then scoots back to pry your thighs farther apart so he can get a better view of your bleeding privates.

“I don’t see why humans get so embarrassed about their bodies. It seems silly.” He rests his chin on his elbow for a moment, hums, then hoists himself up and returns to the table where he’s got a few used pads and the bowl still lined up. 

“Mahito?” You ask, while he’s tinkering with his findings. “Can I put my clothes on now. And a pad?”

“No,” he answers, voice light, without even looking behind him. “I need to put this inside you first.”

You do move to get up off the couch now, a pang of fear shooting through your stomach, but you stop when he turns around with a wrapped tampon held aloft. Where did he get it--the thought flickers, and turns into something more pressing: Why does he have it?

But you know the answer, don’t you?

“I don’t use tampons.” A useless thing to say, but you say it anyway.

He simply blinks at you, and crouches back down in front of you, parting your thighs like air.

“They’re uncomfortable,” you try, louder.

This time, he stops moving, and a little bit of hope flickers through you just long enough for him to furrow his eyebrows.

“But when I make my penis, it’s much bigger than this, and you don’t say it’s uncomfortable.”

Your mouth opens to answer, and your tongue sticks to the inside. It’s stupid to argue with him when he’s got his mind set on something. So you don’t.

When you don’t continue to complain, he nods, then unwraps the tampon and skims the back of the wrapper. At least he’s reading the damn instructions, you think, in the instant before he awkwardly shoves the tampon inside you--too rough and hard, and you whimper as it pinches  in an entirely awful way.

Mahito’s lips quirk. He checks the back of the wrapper again, tsks at himself, and pulls it out. This time, the insertion is less chaotic. It’s still sore, but no longer painful. Just… uncomfortable. 

“Aw.” He pats your thigh. “You did great. Let me start the timer!” He jumps up, hair swinging as he rushes to begin the timer for whatever phase of the experiment he’s on.

“Can I put some clothes on now?” Though you’re no longer hoping to avoid staining your sofa, it wouldn’t be awful to be a little less vulnerable in the moment.

Mahito taps his chin with his thumb, considering. Then he shakes his head. “I want you naked. But we can cuddle on your bed for this part, so you don’t get crabby!” 

There’s no time to voice a complaint or offense; he hoists you up, some of the blood that had smeared against your bottom rubbing off on his arm as he carries you into the bedroom. He doesn’t seem to mind; he simply plops you on the bed--fuck, your comforter--and hops on to wrap himself around you.

Silence stretches around you, even as he wraps his arms tighter and presses his nose against your neck.

“Are… we done after this?” You venture to ask, quiet and tired.

Mahito talks into your neck, cold breath--is it even breath?--ghosting your skin. “Oh, no. I have lots of things I’d like to find out this week.” You can feel his smile pressing into you. “You’re being very helpful, you know.”

“I am?”

Mahito hums against you, and sniffs your hair. His answer is so light and sweet, the contrast makes you feel a bit sick.

“Earlier, I’d considered just grabbing someone to experiment on instead, but since you’re being so sweet about everything, I figured I’d just use you instead.”

The dread in your stomach puffs up, its sodden hairs standing on end. 

“So you saved me from having to find at least one woman to test my questions on. Maybe two,” he adds, voice still light. “Doesn’t that feel nice?”

“Nice?” You ask, voice hollow.

Mahito presses a smooch to your neck. “Don’t most people feel nice when they do a good deed?”

A good deed, to stand in for women who might have otherwise died horribly. For women who would have spent their time not thinking about humiliating childhood period experiences but their families--their partners, their children, if they had them. 

A good deed to snuggle with Mahito, while miles away, someone was begging for death from underneath a mass of twisted flesh.

“I guess.” Your voice cracks, but it doesn’t bother him. You suppose a lot of things don’t bother Mahito and so often, you try not to let them bother you. 

He sighs against you, and presses his hands lightly where you’d laid them earlier to indicate your cramps. His fingers dully stroke against the spot, and you wonder what it would feel like for his fingers on you not to bring mild comfort and the growing tingle of affection--but terror and pain and fear.

You wonder, too, if Mahito ever thinks the same thing.