My sister's friend, Mai-chan, came to stay at my house. She was wearing an ultra-mini skirt with her panties fully visible. I, her brother, was peeking and secretly taking pictures with my phone, but she noticed. She also spotted my porn DVDs and books, so it's obvious that I'm a pervert. After everyone in the family had gone to sleep late at night, I was masturbating while looking at Mai-chan's panty shots I had taken. Suddenly, Mai-chan quietly came into my room. "I'll show you my panties if you masturbate in front of me," she said with a lewd invitation, wiggling her ass provocatively. I couldn't help but press my erect dick against her. "Your dick is about to tear through my panties and go in." Our lust was unstoppable. After stripping her naked, just touching her bare pussy with my fingers made her so excited she almost peed. If I inserted my dick, the amount of pee would be enormous. When I pulled out my dick, she started leaking urine uncontrollably and couldn't stop.
