My sister's friend, Maina, came to stay at my house. Her panties are completely visible in her super mini skirt. She notices that I, her brother, am peeking and secretly taking pictures with my cell phone, and she notices my porn DVDs and porn magazines, so it's obvious that I'm a pervert. Late at night, after my sister and family have gone to bed, I was masturbating while looking at the panties of Maina that I had secretly taken, when Maina came quietly to my room. She made a perverted invitation saying, "I'll show you my panties, so please masturbate in front of me," and teased me with her ass, so I pressed my erect penis against her. "It looks like your brother's panties will tear and come in." Our sexual desires are unstoppable. She was so excited that she peeked just by stripping her naked and touching her smooth pussy with my fingers, so when I inserted my penis, the amount of pee was incredible, and when I pulled out my penis, she burst and couldn't stop peeing.