I'm the worst when my girlfriend's sexy lady secretly seduces me with her whispering dirty words and has an affair.

The first time she's ever met. I was excited and was letting her into my house for the first time, and there was a girl with a huge sexiness, "Sora-san"! The ass sticking out of my shorts, the bulging of my chest, the obscene dirty words whispering in my ear...As a virgin, I was so stimulating I couldn't resist it and I got an erection. When Sora realized this, she secretly played with my crotch by her side... and was taken away from her virginity before her.