You ask Ellie to see you after class as her uniform is not within regulations. She doesn't even listen to you as you lecture her on the importance of sticking to the rules. She laughs at you and insults you in return which gets you hard. She notices and quickly gets her phone out to record and show her friends, she smirks and uses this opportunity to her advantage. She soon knows your weakness, your wife is at home, but Ellie is so much more fun, and she knows it. A lot of humiliation and teasing, not so much a jerk off instruction but ends with a cum countdown