[Locked] help me Fakku-one kenobi, you're my last hope

i've been looking for a two part+ h-manga about a boy and a girl trying to spy a couple fucking in the woods. they are spotted and taken to the couple's house. There, they swap partners, and the man take the girl's viriginity while the wife take the guy's viriginity. All the while he can't take off his eyes off the man fucking the girl and the girl liking it.
The second part, the guy convince a nosy blond girl classmate of his to follow him, he lead her near the house of the couple and they hide to spy the couple having a threesome with the first girl. The guy successfully applies the lesson he learnt from the man on how to make any girl his on the blond girl.
Thanks!

i've been searching for these for the past 3 months. thank you!!