You knew they were also locked when they asked to lock you up, but you had no idea they expected you to match the time they already had in their belt, and since she was Ace it wasn't difficult at all for her to last the 3 years she already had.
You made a bet with another girl over who could stay locked the longest, loser gets photos of them in their belt released in the college forums boards. The first month was fine, the second month was hell, but the 3rd year? Even using the bathroom was eno