Do you have any Monster Heat headcanons for ut & uf sans, and us & sf papyrus while having a s/o? If you're into that sorta thing.
Oh boy, do I!
Okay, so first thing’s first; I gotta explain how I think monster heats work in my mind. So, monsters don’t experience heats until they get into a committed relationship because they don’t want to breed with just anyone. However, because of this, they are woefully unprepared for their first heat, as it varies from person to person, but it usually lasts around a month twice a year. So, that being said,
He knows something’s up because he has a lot more energy than normal. Like, a lot more. And he can’t help but blush every time he looks at you because he can’t stop thinking about pleasuring you. After he puts two and two together, he realizes it must be his first heat. The only thing that is really affected is his sex drive. While he usually prefers being a sub, he’ll want to try both with you, and he’ll want to do it at least twice a day. No behavioral changes or possessiveness with this skele.
At first it’s hard for him to tell because his libido is high on a regular basis. The real difference is his behavior in public. Usually if someone else hits on you he promptly lets them know you’re taken, but this time he straight up grabs your arm, says “nope,” and just teleports the both of you home. Sex with him is going to be really slow and gentle and he pretty much smothers you in affection when you’re at home.
He knew what it was as soon as he woke up because it hit him like a fucking freight train. He tries to get you to stay in bed longer for cuddles and morning sex. And even after that, he can’t stop thinking about you ALL DAY LONG. Usually thinking about you during the day makes work bearable, but this is a bit much, and is actually getting in the way of his job. In public he’s lowkey possessive, so he's even more handsy than normal, slinging an arm around your shoulder, resting his head against you–he’s doing everything he can to let the world know that you’re a couple because he doesn’t even want to face the slightest chance of there being competition for you. And the physical affection doesn’t stop there. At home he tries to find any excuse he can to touch you, usually by offering you a massage (which he already does for you only it’s more often now). His drive is naturally high. The only difference there is that he wants more morning sex.
The heat kind of creeps up on him. At first he just thinks he’s feeling a little more frisky than usual, but he gets in those moods now and then. Then the feelings worsen and he decides he doesn’t want you seeing him like this, seeing him so desperate. Around you he’s more on edge, and as soon as he starts thinking about fucking you, it’s “I just remembered, I have to do…something. Be right back!” Although he’s still not back after an hour or more. Concerned by his recent behavior, you knock on his door, but all you hear is panting and moaning. It doesn’t really cross your mind until you open the door and see him furiously rubbing his ecto-cock, which is glowing brighter than ever. Why didn’t he just say he wanted to have sex? Once he apologizes for his behavior and explains what’s going on, he beckons you in and asks you to help him out.