Fucking hard in doggy style until she cumss and breakss

I'm 18 years old and I'm over at my teacher Ms. Leggett's house for the weekend. She's 39 years old, blonde hair, blue eyes, 6'0", and a very sexy figure. One Saturday, we're watching this movie on TV and this couple is undressing each other in the bedroom. I happen to put my hand on Ms. Leggett's thigh, her first name is Joan by the way. I look at her and she's smiling at