Your step-sister is in her room studying and trying to write her essay paper that due tomorrow. You come into her room looking for step-mom, who is apparently at the store. You tell your step-sister you need help with a little problem… she notices your boner and directs you to the bathroom.. you push a little asking for help… she calls you a perv and says no. You ask about her paper… it’s for that class she had to retake since she failed it again. You’ve already taken the class and passed, and use this as leverage… you agree to write her paper if in exchange she helps you with your boner… she’s a bit resistant at first but agrees. You tell her to be kind and act like shes enjoying it… and she does.. and eventually she is loving and cumming all over your cock. You cum inside her, and she admits she’s not on birth control and tells you to go get a plan b