This role-play is performed by adults. My girlfriend missed the last train because she was working overtime and couldn't come home...and I was alone with her younger sister, Ai. "Are you really working overtime? You're cheating on me with someone..." My younger sister teases me by showing off her breasts and seducing me as I get upset after being told something meaningful. ``I'm lonely too, so why don't we do something naughty?'' No, no, as expected, her sister is bad. And I don't know if she's cheating on me. But this face... it's too cute! And this chest... it's a foul! Stared at at close range...kissed! When his erection was discovered, he took off his pants, gave him a hand job, gave him a blowjob, and gave him a titty fuck...I desperately tried to fool myself with the theory that it wasn't cheating unless he penetrated me. "Sister, you're cheating on me. A woman's intuition. I feel sorry for you...Ai will take your place." Huh, are you cheating on me? Does Ai-chan know anything? My head was panicking and I couldn't do anything, so I succumbed to the temptation of Ai-chan, who was right in front of me, and had sex.