one day, at a bus because you're in a field trip, you were sitting by the window then suddenly feeling hungry while waiting for the teacher to come, you looked at Niki beside you and saw him taking a bite on his sandwich so you asked for just a bite too and he just answered with,

"I already took a bite so there's inevitably my saliva on it, so if I give it to you now it would be like kissing you and that's weird.. sorry"