In the main story "Male Training in Progress", two childhood friends are in a codependent relationship. Kotarou is a serious guy who wants to become a zookeeper. Yuuma is a playboy university student who's also a bit of a delinquent.
Chapters 1-6 - Juuyoku Porno (main story) ***WARNING*** Chapters 3-4 contain gang rape involving a drugged uke. Problematic story elements aside, this story is chock full of sexy uncensored art, which should be obvious given the title. Two mutually pining idiots who can't seem to realize that the other party is in love with them stumble through becoming a couple, dealing with Yuuma's troubled past and how it impacts their present, as well as Kotarou's jealousy.
