I asked before in Aggre boys and I shall ask again in Bad boys. Where do the bad sanses like to kiss mc?

Dust... ah, he's traditional. He likes to kiss you right on your pretty mouth. Mostly because he loves your reactions to it. He's usually so restrained, so impossible, so featureless. His affection is limited to the smallest of kind gestures. But then, every now and then... he leans in, cups your cheek, and catches your mouth with his. It's an unmistakable and undeniable declaration of how much he likes you. You're never prepared for it, and it makes him smile every time.

Horror really likes kissing the top of your head. It's the easiest place for him to reach, he doesn't have to lean far down and hurt his back, he can surprise you with smooches from above whenever he feels like it. He likes the smell and texture of your hair, too, so it's a great excuse for him to get some nuzzles in and just get lost in the feeling of being in love.

Killer goes for the neck. It's very intimate, it appeals to his possessive nature, and if you're at all ticklish you're going to be making all of his favourite sounds. It's a kiss that demands 100% of your focus, just like him - a quick smooch anywhere else is cute, but it's soon forgotten. Whether you're accepting it, or squealing and ducking away from it, a kiss aimed at the neck will get him all of the reactions and attention he craves so much from you.

It also leaves black tear marks all over you. Perfect

Nightmare, the gentleman that he is, has a particular penchant for tucking one large claw under your fingers and raising your hand to his teeth to kiss your knuckles. Hand kisses are a lovely way to show you how devoted he is. However, he also prefers hand kisses because of where they can lead... what's stopping him from turning your hand over and kissing your palm, too? Or your wrist as well? What about drawing you in, and slowly pressing kisses all the way up your arm, until you're stammering and hot in the face? A kiss on the hand can be anything he wants it to be.

For the bad Sanses, if their SO would want to grow old and die, would they respect that?

Agh... well. Short answer? No. Long answer? No, absolutely not.

Horror, I think, would come the closest to actually respecting your decision. He has Papyrus to support him so he wouldn't have to go through it completely alone. He's experienced a lot of loss, and he knows the pain of seeing people you love hang around long after they should've gone, deteriorating into someone you hardly recognise. But also... he's just really not in the right frame of mind to let you go. Horror does not love in halves and the thought of losing you is like a point-blank shot to the Soul. If you bring it up, best reaction you'll get is him being confused and then pretending you didn't even talk about it, and the worst is a full smashing-things-flipping-tables-throwing-chairs meltdown. You might get a better response from Papyrus. He'll try to mediate. Perhaps give it a few years, once he's had time to ease.

If you press Dust about it, he will give you an ultimatum. If you really, really want to grow old and die, the relationship is over. You can die, if you like. But don't expect him to watch. He knows that when you go, part of him goes too, and at least this way his time feeling warm and whole again ends on his terms. He can sink back into the dark by choice. You get your wish, but you'll never see him again. He'll be pretty sour grapes about it (and about you) if you do end up choosing to die. As far as he's concerned you chose your mortality over him. He doesn't respect it or understand why. He feels abandoned and betrayed... and he refuses to reminisce positively on something that hurts so much to think about. Someone bringing up your name is enough to start a brawl.

Killer doesn't understand. You want to die? You want to leave him behind? You want him to be alone again - how could you say that? You don't mean that. If you hold your ground and tell him you really mean it, he'll tell you he's fine with it, but he's a bald-faced liar. Whilst Dust is bitter, Killer is shattered; he really thought he found someone who would stay by his side no matter what. The rug has gone out from under him. Now he's facing the prospect of being utterly alone again, surrounded only by the voices that still taunt him even now. He fully retreats into his own head... he acts like he's silly and fine, but his Soul has never been more red. You'll never see his white eyelights again.

Nightmare... uh, no. Sorry. He laughs it off like you're a kid telling him you want to eat a billion cookies. He thinks he knows better than you, in this regard, you don't really want to die, you'll understand in a few hundred years. He's a reasonable lover in most aspects but this is one of few things he doesn't budge on. Part and parcel of being a God's beloved, I'm afraid. D'aw, you want to grow old and die? Sure he'll let you. Aren't you cute. Just don't pay attention to how wrinkles never form on your skin. I'm sure it's nothing.