After reading all this, I'm starting to wonder if Yashiro's shirt really was covered with blood or he just wanted to get rid of Doumeki...?
If you look you can see the shirt in the trash can with blood on it, though he probably did want a moment to himself. Seems to me he's becoming conflicted with his feelings
I think that Yashiro was turned on when Doumeki started to wipe him down that's why he went into a fetile position so that Doumeki wouldn't see him. Yashiro made an excuse to make him step out so he could finish in private.
Yes! That's exactly what I wrote in my comment above. (sorry for not noticing your comment first! :(
http://www.mangago.zone/read-manga/ten_count/mf/v02/c011/15/
that's what i was wondering as well.. it's definitely related to kurose..
Maybe we'll soon get to know something about his past too...