My aunt Aka-nee, a slightly older sister, who is beautiful but has no life skills, but who I have always admired. The main character gets a chance to live together with such an admirer for a certain reason.

As soon as they start living together, the main character is seduced by Aka-nee for fun, but she ends up seeing his young and muscular erection and ends up having sex with Aka-nee, who is getting more and more aggressive!

Seeing this as a chance to hold the beautiful, huge-breasted aunt of his dreams, the protagonist demonstrates his pride by repeatedly cumming inside her and making her cum all over the place, making her completely his own personal woman.

It would be a shame to keep such a nice dick all to yourself. With this in mind, Aka-nee invites her beautiful and attractive friends to her house one after another. The main character who has completely corrupted all of them with the same immense dick. Thus began the harem life of Aka-nee and her friends - older, erotic ass beauties with huge tits and a lot of Nakadashi (cumming inside) sex!