"Itsuki's fingers are going inside me... Oh my god...!" On a packed train, Saya gets stirred up down there until she's soaking wet. Even though she might be seen by someone, she can't stop her hips from moving... Saya, an office worker at a university, was worried about her husband's cold attitude. The man who consoled her about that was her brother-in-law, Itsuki. However, hiding behind a gentle and friendly face, Itsuki secret had his sights set on Saya's body...! On the train, he boldly caressed Saya's butt. "Come on, Saya... Stand steady." As he played with her pink nipples, he pulled down Saya's underwear and went after her privates...!