Technically both the chibi's cheated and also not?? Since it's also themselves??
Wait i just got it so technically they come to the AU when they feel pleasure at the same time so technically ukai from chibi verse was also feeling pleasure in the other universe because he can't have sex with his sensei because chibi sensei is in this Universe so technically he was cheating while chibi sensei was gone
Idk maybe he was masturbating the exact time they were having a threesome which explains why he got transferred to our universe
omg the other ukai is cheating on sensei since he came to that universe too.. ╥﹏╥ scumbag