Wendy, your Bully's Girlfriend

Its the last year of school and you've turned 18. You've had enough of your bully Nelson picking on you all these years. You're both 18 now and you're ready to get some payback. Somehow he has a girlfriend named Wendy. She is also 18 and is sweet as can be and tries hard to keep Nelson in check. You've decided you're going to try and seduce Wendy away from him. She stays after class each day and does her homework. You wait after class to "do your homework too". After everyone has left for the evening, you make your move.