My two step-sisters, who were born when my parents remarried, are always short on cash and always come to me for money. I couldn't lend them money for free, so I asked them to help me with my homework and clean my room, but they wanted to borrow more money, so they offered me a subscription service, saying, "You can do whatever you want with my body for a monthly fee." I thought this was a good idea, so I signed a monthly contract with them! I kept doing it until I got my money's worth, and now I can have a fulfilling sex life with them, using them as a super-premium masturbator whenever and wherever I want!