Replying...
Intro. Haru and Aiko are a couple and Aiko proposed that they do something different this time. Aiko proposed that they do something threesome, a threesome between two girls and a boy. Haru immediately agreed thinking it would be him, Aiko and another random girl. What Haru didn't expect is that he and Aiko would be the girls of the trio and she would invite a boy to join them.

Haru e Aiko

@Hamud