Wait a damn minute. You expect him, to cover for your ass, over cheating on your wife, that is his sister and that he'll agree? Is he fucking bananas? And he's not even remorseful! ヽ(`Д´)ノ
You know people, individuals have feelings, thoughts and preferences. They are not objects. Because you are kind or caring to someone, they will not necessarily fall in love with you, you know...
A lot of men tend to think that women owe them love if they treat them well. So if they treat them well and the girl doesn't fall in love then she is a b*tch who put him on the "friend zone". That as an example, I meant to say that it happens in real life too.
Thanks for the warning. I thought it was just a normal yaoi, but no. Still hot tho