"Fucking Raw is the Best Cardio" - I Became His Personal Training Tool

I'm done with being bullied! I hate to admit it, but I need my stepbrother's help. He has to train me so I can get stronger. I knew he wouldn't just say "yes," but I also didn't think that he would ask to use me as his personal training tool in exchange. I had to agree... I really needed him, so if being used by him was all it took, I was ready to pay the price. He can carry me, throw me around, and fuck me raw as part of his cardio. Whatever he needs, as long as I'm getting something in return.