Yumiko started working part-time at my workplace. With her big tits as her charm, she began dating me and started demanding sex every day. She even showed off her masturbation, making me jealous. Since she always said, "Let's have sex," I let my guard down—only to find out she was cheating. When I confronted her with the evidence, she happily said, "I still love you, Senpai," so I tied her wrists and spanked her. While she squealed and writhed in pain, I creampied her with a massive cumshot.