![](https://pic1.mangapicgallery.com/r/avatar/17/u126950_50x50.jpg?2)
Just finished reading.
The main uke did had to service another with his body due to some circumstances.
The main seme did had to marry another, but dunno if ever touched him. He did had to drink someone else blood, but touching them in that way he does not.
So it's not really cheating, when they actually don't really realise they love each other until they loose each other. (They aren't officially attached until they really confirmed their feelings of each other for many many chapters later. However it was like a roller coaster, hurting each others feelings, being confused, and only think of obligations.)
Please, before I continue reading, I would like to ascertain that The Vampire chan and Uke chan did not sleep around and cheat on the other because I cannot stress my heart and mind with cheating characters.