A girl named "Yumiko" came to my workplace as a part-timer and she has really big tits. We started dating, but she came to me every day and even showed me how she masturbates! She always said "Let's have sex"... So I left her alone for a while, and it seems she started cheating on me. When I found the evidence and confronted her, she said something nice like "I love older men after all," so I tied her wrists and spanked her until she writhed in pain and then I ejaculated inside her!