YSN-465 I should be used to seeing my sister in her underwear, but I unexpectedly got a full erection. My sister was playing with my dick half-jokingly, but she ended up getting more aroused and played with it until I was completely spent.

I had some business to attend to at my sister's place and found her in the middle of changing clothes. I was flustered, but carelessly got an erection for my real sister. I thought she would be shocked, but instead, she smiled and approached me, saying, "What's going on here? Explain it to me." Even though she knew, she pressed me and started playing with my dick. When I let her do as she pleased, she brought me to climax with techniques rivaling those of a sex worker, all in 6 episodes.