I hired a prostitute, and my girlfriend's stepsister showed up

I hired a hooker that night, and when I opened the door, it was her my girlfriend’s stepsister. She looked at me with a surprised expression and immediately said, If you don’t let me go, I’ll tell my stepsister everything. I didn’t back down. I told her that if she opened her mouth, I’d tell her parents exactly what she was doing. She was silent for a second and then agreed. She started slowly taking off her clothes, got down on her knees, and sucked my dick like a real whore. Then I put her on all fours and fucked her hard until I came inside her. Nobody found out.