You do

As your both sitting down on the couch, you give a quick playful slap to her crotch. She let’s out a little moan and delivers her own slap. Unlike yours, her slap was fast and hard as if she were trying to castrate you. You turn your body so she’s only able to hit your thigh.

You both quickly stand up facing each other. From the look in her eyes and her previous attack, it was clear that this wasn’t going to be a playful game.