Give you her bottoms

You go down in to a cobra pose at the request of your instructor all the while you stare at Katie’s ass. Suddenly, your underwear begins to bunch. You shift a little as you feel it begin to wedgie. You attempt to grab at it and pull it out but to no avail, as if there wasn’t any fabric to grab. Not only was it bunched in your back, but it was right in your front. Tight and... soft. You stood up and felt it press against your crotch. As you begin a tree pose you feel another shift. Your basketball shorts get tighter. You feel them slowly creep down your legs as the fabric becomes thinner and less coarse. They get tighter and tighter until they too are bunched in your rear and crotch. As you begin warrior pose you look in the mirror. You’re shocked by what you see.No longer are you wearing basketball shorts... you’re wearing yoga pants. Not just any yoga pants either, they’re Katie’s. You look closer at the pants as don’t see a seam where it would be if you were wearing boxers. That means... you look at Katie’s reflection with horror as she gives you a condescending glare. As you move to the next post you feel the lime thong chafe, praying that your embarrassment would be over soon.