Hachi X Reader Platonic - Tumblr Posts
Nana ~Wait, you're what?!~
The first part of the request is here.

"You're what?!" That's what Nana hears when she comes home from a tiring day at work. Closing the door behind her, she goes to the source of the noise, her friend Hachi, in her little sibling's room, and what she sees makes her feel multiple emotions: Hachi is holding (Y/N) tightly with tears in her eyes, the girl has a shocked face, and Nana is sure of seeing a bit of panic in it too, as she shakes the hand of... Shin?! What is he doing here?
"Nanaaaa! Our little sister got engaged to Shin, I'm so happy for them!"
"Hachiko, she's my sister, not yours!" The woman replies, without fully realizing her friend's statement. After a few seconds, though, having understood what she said, she stops to look first at her sibling and then at her alleged boyfriend, shocked and with her mouth open and eyes wide.
For about five minutes, there's dead silence in the room -only the sound of the fan, turned on due to the unbearable heat, and the music of Trapnest (which only increases Nana's annoyance) downstairs can be heard-, while everyone realizes in different ways what has just happened: (Y/N) is squeezing the hand of Shin, who's also wide-eyed and worried Nana will separate them, very tightly with almost tears in her eyes; instead, Hachi has just realized what she's done and, as she lets the girl go, she tries to correct her words with a confused stammer, waving her arms in front of her.
"Wait, you're what?"
"Nana..."
"(Y/N), what are you?"
"Big sister -(Y/N) starts speaking hesitantly- Shin and I love each other, a lot. Whatever you say, whatever you do, our feelings won't change. I know you're worried about me, but I'm not a child anymore: I can decide who to be with. With Shin I'm so happy, and he makes me feel so loved, so, please, don't push us away." As she finishes speaking, the girl's voice cracks and her eyes begin to fill with tears, so Shin approaches her and puts his arm around her waist, bringing her closer to him.
Nana takes a deep breath and approaches the couple, then gently stroking (Y/N)'s hair and murmuring: "You've grown up..."
She then turns to Shin: "You, if I find out you hurt her, I swear I'll kick you out of BLAST and make you pay for what you did. Have you understood?"
The boy nods and the woman gives a very small smile, holding the couple close.
"Well! Now let's go have a drink!"
Shin and (Y/N) move on, still in disbelief at the ease with which the girl's big sister accepted their relationship, so Nana and Hachi are left alone to talk.
"I'm happy for our little sister."
"My little sister." The brunette corrects.
"I'm happy for her too -She continues- although it seems to me she's growing up so fast..."
"..."
"..."
"Nana, are you crying?"
"I-I'm not crying, I just got an eyelash in my eye!"
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