Responses

Well, he doesn't need to ask Hiro-san. There is also Nowaki who seems to be fully aware Hiro-san relationship with Usagi-san before.
Misaki did asked Usagi bout it but answered in a very... peaceful way. I guess? He kinda dodged it and I understand, it was Usagi-san's dark history as well as Hiro-san's.

did they have sex more than once? I thought they have sex just once mmmmmmm ┗( T﹏T )┛
I really wanna know how Misaki would react if he knows Hiro-san is actually Usagi's sex partner as a substitute Takahiro.
Im dying too see that lol