Boku ni Sexfriend ga Dekita Riyuu, Episode 3
OVA 僕にセフレが出来た理由 / Boku ni Sexfriend ga Dekita Riyuu
Saki, a confident blonde gal, and Koharu, a shy, busty bob-cut girl, visit their fellow café coworker’s room for some fun. Driven by her fascination with the opposite sex, Saki seduces the protagonist, and they start having sex right in front of Koharu. Too timid to voice her own desires, Koharu becomes a silent observer, staring intently as an odd, voyeuristic triangle forms between the three teens.