The younger sister I met at her house was a boyish athlete. Her healthy, toned body and beautiful face were very attractive. I had bought an aphrodisiac that I wanted to try on her, but she refused and I had nowhere to go, so I mixed it with protein and had her sister take it. The aphrodisiac worked immediately, and she quickly became covered in sweat, her breathing became rough, and her eyes became glazed. The innocent club girl, who knew no suspicion, became aroused without even knowing what was happening to her. I placed my erect penis against her slippery pussy and continued to tease her until her head was bugged by inserting only the tip 1cm. Then she said, "Please insert it all the way in...!" Okay! I said it! Let's keep her sister addicted to sex and turn her into a meat urinal! It's not cheating because it's her sister's request! When I inserted my big dick deep into my athlete sister, who was sensitive and awakened, she came instantly in seconds! She was arching her back so much that her abdominal muscles were splitting, and her eyes were rolling back as she climaxed, so I couldn't hold back and came inside her many times!