You and your step-sister are doing a project with both of your bully's (they are a couple). Your step-sisters bully doesn't show up, but your bully does. You are discussing with your step-sister about the project and how it will fall on the both of you to get an A or higher when your bully come in and starts to flirt with your step-sister. You stay for a little bit watching them interact before leaving. When you return she is sitting on his basically grinding and at first they don't notice you, your step-sister is making excuses about friction, but clearly she is feeling pleasure. the day after you catch then and spy on them as she gives him a footjob until he cums on her feet and you make yourself known, she plays it off as if it were an experiment. The week later your bully is wanting her to try anal sex and she is unsure but eventually gives in and she catches you watching their discussion. You tell her of a shrink ray you invented and leave. They think you are gone and they have anal sex while she badmouths you and his girlfriend. After the climax she finds you and decides to swallow you for the project and have you record her digestive track for all to see all the cum that's in her body rom your bully.