Feel kinda embarrased cause I really liked it even thoush it's just about sex. It's a oneshot. One dude is a scientist and he has a crush on his brother's exboyfriend. He's his friend. He wants to know what his friends preferences in man are so he makes 2 clones of himself. They end up having FOURSOME - with the friend as uke and the scientist with his clones as semes.
Fukusu Mobure BL