When I Introduced My First Girlfriend To My Father, He Cuckolded Me With Seeding Sex. Miyu Oguri

My father's womanizing was so bad that my mother left. So I was nervous about introducing my girlfriend to him, but I thought my girlfriend would definitely be fine even if he tried to hit on her, and since we were dating with marriage in mind, I decided to introduce her. But... I never imagined I'd end up seeing my father and my girlfriend having sex...