My Girlfriend and I are staying at her step-moms house for the weekend and Unfortunately she's on her Monthly cycle, so no pussy for me, which isn't any surprise. My girlfriend decides to take a bath and asks me to get her a pair of granny panties from her step-moms room who just left for work so I go to her room and look for panties, As I was getting her panties her step-mom comes home so I run to the closet and hide. She starts to undress and change out of her pantyhose into a new pair, wow she looks so hot, my cock is bulging from the sight of my girlfriends step-mom, I have a secret pantyhose fetish. When she leaves I can't help but pick up and smell her pantyhose, so fresh and warm I start stroking my cock with her pantyhose, all of a sudden her step-mom barges in and catches me jerking off to her pantyhose. Surprised she says she won't tell If I Jerk Off and watch her masturbate in her pantyhose, I can't believe what is happening, I agree, I'm so turned on as she plays with her wet pussy, her pantyhose are getting wet. She grabs a dildo and starts fucking herself with it, she can't hold back and says I need real cock, fuck me now, we rip a hole in her pantyhose and fuck in multiple positions and I finally CUM all over her Fat Ass in Pantyhose. She wipes the CUM off with the panties for my girlfriend and says here go give these to my step-daughter. How do I explain this?