Stepsister sucks my cock in exchange for me not telling on her for stealing

My step-sister gives the best blowjobs. I saw her last week on the camera. I hid in her room, giving her boyfriend a blowjob, and since then, I have been looking for an opportunity to manipulate her into giving me a blowjob. I finally get my chance when I catch her stealing from our parents. In exchange for not telling on her, she sucked my dick till I came.