How would sf, us, Uf, and the undertale bros react if their s/o kisses them on their cheek and left a very noticeable lipstick mark. And them telling them to leave it bc it looks cute - ^w^
(Only take 6 characters, so cutting US)
SF Sans: Lovepal, he appreciates it, but please don’t leave…ohhh my god, it’s not going off, ahh! He is blushing as he scrubs madly at his cheek. He is so flustered. Help him, please.
SF Papyrus: He, cute. Your love really leaves marks, doesn’t it? He doesn’t mind, he thinks it’s rather nice to see your kiss after it already happened.
UF Sans: He's gross. He won’t wash it off. He barely washes himself anyway, and that just gives him another reason to be a dirty boy. He can’t help but rest his fingers on the mark from time to time.
UF Papyrus: Wipes it off right away, angrily. Don’t do that, he can’t go out like this in public! But you can see him stroke his cheek and blush slightly as he walks away.
UT Sans: Gives you a grin in return, he adores your kisses. Blushes a bit, pulling his hood over his head as he notices the mark, trying not to let you see how flustered you got him.
UT Papyrus: His eyesockets go wide, filled with small stars. Oh, he is so happy! You kissed him, and he loves your kisses. But this time you left a sign that you kissed him, that he can treasure. Just…why is lipstick so…greasy?