
Okay yep, Saiji stays with Aiji because he pities him and feels like he is responsible for Aiji's misery, that's why he didn't do anything against Aiji's plans of finding Saiji a new mate. For Aiji, he stays with Saiji because he is in fear of being abandoned by him, so before Saiji really abandons him, he wanted to separate himself from him so he won't be hurt so much. But at the end Towa changed their minds, but the fact that they still feel responsible for each other doesn't change. Kinda deep in the wrong way.

http://www.mangago.zone/read-manga/kajou_mousou_shounen/uu/kajou_mousou_shounen-chapter-1/9/
Nahh that's fucked up, now that's fucked up. This bitch can taste anything without gaining weight! He's eating air!
That glasses guy is rubbing me the wrong way.