"How to deal with attacks from behind."

You feel a little awkward as Monica turns with her back towards you, taking each of your wrists in her hands and draping them across herself, over her arms. Your front is pressed totally to her back, and despite your familiarity with Monica, you aren't so familiar as to be comfortable with this. Nonetheless, Monica continued with her explanation.

"See, if someone comes up from behind you, pinning your arms like this in a bear hug, you should take your leg and kick back into the knee. Then..."

You zone out a little bit as she teaches the class. You can't help but notice the awkward way your bodies line up- your crotch comes is pressing directly against her rear end. Your gym shorts and the lycra fabric of her yoga pants don't leave much to the imagination on either end, so you can definitely feel your penis stiffen, pressed straight up between her butt cheeks as she shifts to demonstrate a stomp to your right foot. Judging from the way she falters for a moment, she seems to notice it too. She glances back over her shoulder and you can't tell if her smirk is genuine or if she's just trying to keep her expression in front of the class. Her words are what catch your attention, though.

"Alright, now that we've got the process explained, who wants to see it altogether, in action?"

Your heart sinks, as several students raise their hands.

"Or, I know this is recap for some of you. Would anyone here like to help John demonstrate?"

The rest of the students raise their hands, and your heart sinks further. You aren't sure whether you want Monica to pull away from you or not, but you have a feeling your in for some trouble whatever comes next...