Sammy handcuffs Genny to a door and tickles her until she pees her pants.
Some how Sammy manages to convince Genny to go along with being hand cuffed to a door, arms held up above her head. Once secured, Sammy takes advantage of this compromising position to relentlessly tickle Genny.
Genny is incredibly ticklish. With her arms held up, there is nothing she can do to protect her armpits from Sammy. She twists and turns and tries to get away, but there is nothing she can do.
Before long, Genny is peeing in her pant. Not just a little leakage, but a full out flood- Pee running all the way down both her legs and making a puddle on the floor.