Musuko no Tomodachi ni Okasarete
English title: The Cougar Trap
Japanese title: 息子の友達に犯されて
Type: OVA
Episodes: 2
Source: Visual novel
Genres: Hentai
Studios: Y.O.U.C
Producers: Digital Works
Duration: 27 min per ep
Rating: Rx - Hentai

Yoko is happy. She lives a peaceful life with her husband, Masahiko, and their son, Kazushi. But there is one thing she complains... They haven't had sex for a long time. One day, a friend of Kazushi comes to her house. His name is Ryouto. He is handsome and polite. But she doesn't know yet that Ryouto has a secret personality...

(Source: AniDB)