One time we had sex while I was holding in my pee. I said I wanted to go to the bathroom, but she wouldn't let me. After laying absorbent pads all over the floor, she had me sit on top of her, fucking me while pressing down on my lower belly. I was about to cry, but she kept feeding me water and continuing to fuck me. Then I couldn't hold it anymore and gushed clear liquid all over the floor... She got really excited while I was peeing, kept groping and thrusting until I begged for mercy. Because it was the first time playing like that and it felt so humiliating, I just clung to her the whole time, burying my head in the crook of her neck and calling her "sister."