Ever since I lost my virginity to my older sister when I was little, she plays with my dick whenever she has time! Honestly, it was amazing to have sex with my sister, who I also love! ...That's what I was thinking. Suddenly, my girlfriend's sister came to end our relationship because she was getting married! She's been addicted to my dick for over 10 years, so there's no way she can switch to another dick now! I'm such a selfish person.