How I made my stepsis fuck me

She needed help with her studies and I needed to have my dick sucked on a regular basis and fuck at home without having to chase girls around. My 18 y.o. stepsister and I were meant to be lovers and boy did she enjoy jumping on my big cock and taking it balls deep both in her mouth and pussy! It took me some long negotiating to persuade her to try it, but now she begs me to fuck her every day and even lets me cum inside. Kinky family as it is!