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Legs, Tits, Or Ass with UT,UF,US!
The question of the hour y'all! This one was fun surprisingly I had the most trouble with Blue! Hope you enjoy! Put it under the cut because it was slightly horny then decided to run with it lol

Undertale:
Sans: Legs, 100%. There's just something about them that gets him going. He wants to massage your feet and kiss your ankles before being buried in your thighs as he eats you out. Squish his skull between those legs he loves it. Is one for more gently caressing them with a loving look but bites on occasion.
Papyrus: This is a tough one Papyrus would definitely be one to say personality and that's true but if it came down to it boobs. He likes how squishy they are and enjoys watching them bounce as he fucks into you.
Underfell:
Red: Ass. Assman all the way. He can't get enough it's so squishy and jiggly and he's hypnotized literally anytime you walk by him. Holds the door for you just so he can see you walk in front of him. A chromic ass slapper no NOT turn around or bend over in front of him unless you're ready to get that thang smacked. Will turn himself on simply from watching your ass as you walk around and pull you into the nearest closet/teleport home to work off some steam. This happens at least once a day where he gets himself too horny. Has tons of pictures of you bent over. He's pretty quick and perch with his camera. If hate to watch them go love to watch them leave was a person. He
Edge: Legs! He enjoys something about legs and thinks they have a certain elegance to them. Long legs, short legs, thick or thin. He's an enjoyer of the legs and loves to mark your legs up with his sharp fangs. Enjoys having your legs wrapped around him or over his shoulders most though. He likes seeing all the different positions he can move them into while having sex.
Underswap:
Stretch: Boobs. He likes the squish as well and enjoys watching them bounce and move naturally. If you have some he'll treat them like a stress ball and absentmindedly squeeze them while doing others things. He enjoys watching them bounce when you ride him. Also a huge nipple teaser he likes to latch on with his teeth and pull gently.
Blue: Boobs! Also a boobs man he loves how squishy and jiggly they are. He likes to nibble on them and enjoys the squish between his teeth. Expect your chest to be full of bite marks if he has access to it. Likes seeing the different ways he can make them bounce with the different positions. He likes cumming on your chest and watching it drip down. He enjoys laying his head on them as a pillow and listening to your heartbeat.