Immersion is inevitable...!! Beautiful women who fully accept you will praise your penis (identity) in a completely subjective way and make it erect♪ [chapter 16] ~ Cheating sex, lured by the busty body of my girlfriend's sister ~ <<Today, I was invited to my girlfriend Yuina's house and I was excited...! However, her university lecture was running late, so she called me to wait at her house first.... When I rang the doorbell, I was greeted by Yuina's sister Maina. She was super beautiful and too pretty. And most of all, she had big breasts that Yuina doesn't have... Oh no, no. She guided me to her room, giving off a nice smell. After waiting for a while, Yuina contacted me again... She said she had a sudden part-time job and would be going home today! And...!? When I had no choice but to go home, she asked me, "Oh, you're going home already, boyfriend? Well, will you join me for a drink?♪" and we ended up drinking together for some reason. My penis gradually reacts to Maina-san who is wearing light clothes and no bra, and Maina-san notices it... 》#Praise photo Maina B:88 W:58 H:85