Admin Mawile: ヾ(・ω・`。) This is assuming that s/o is the vampire!
Shuu:
-He doesn’t even notice that you’ve slipped into bed with him, and remains fast asleep. There’s a good chance he’ll wind up cuddled up to you in his sleep, unconsciously seeking out the presence of someone next to him.
Reiji:
-He’s a light sleeper, wand wakes up almost as soon as you slip into bed with him. He’s too terrified to do anything to remove you and doesn’t manage to get much sleep for the rest of the night out of worry.
Ayato:
-He’s a heavy enough sleeper not to notice you joining him, and very soon winds up sleepily cuddling into you, body unconsciously moving towards even what little warmth a vampire like you has.
Kanato:
-It’s about fifty fifty that he’ll sleep through you sliding into bed with him, but it’s almost guaranteed that he’ll wind up pressed into your chest. He instinctively latches onto things in his sleep, and that includes anyone close.
Laito:
-He wakes up instantly and scoots over to let you join him. There’s a decent chance he’s faking being happy that you’re there in the first place, but he honestly enjoys the closeness more than he’d like to admit.
Subaru:
-He probably won’t wake up when you slip in next to him, but at some point in the night, hes going to wake himself up and notice. Then, he’s going to very nearly scream, horribly startled by the sudden intrusion.
Ruki:
-He wakes up almost instantly, and obligingly allows you next to him. He doesn’t really want to know what would happen if he didn’t let you, and if this is how he’ll get a full night of sleep, then so be it.
Kou:
-Having someone close to him is one of the few guaranteed ways to keep away his nightmares, and he’s snuggled up to you without a second thought. Even if you demand something in return later, it’s worth it.
Yuuma:
-He’ll definitely sleep through you joining him, but you might have a hard time getting any rest. He snores horribly and moves around in his sleep, and you’l find yourself getting very little rest while next to him
Azusa:
-He probably doesn’t wake up, but winds up slowly pressing himself closer to you in his sleep. You may not be very warm, but a person next to him is a very comforting thing, even if he’s too sleepy to really notice.
Carla:
-If this is what you want, then it’s probably unwise to get in the way. The closeness is admittedly a little bit nice, and the only real problem is that you’re going to see how much of a mess he is in the mornings.
Shin:
-He’s a fairly light sleeper, and wakes up to moderate horror when you slip in with him. It’s not what he was expecting in the slightest, even if he his eventually able to ignore it and go back to sleep.