Where did they have sex? Nii-san just said, if it's sex, he can also do it, then they stopped. They did not have sex
They didn't though.
In the 4.5 chap I think they only got married out of connivence not because of love.
maybe? maybe not? that's one of the flaw of this manga
Leans more to marriage out of convenience though.
They didnt have sex but he did touch him
Lets not forgetting about the nii-san's wife. Shinobu's nii-san still has wife but why he's having sex with his brother previously?? I dont understand...