I want to start off by saying I know some artist don't like taking suggestions rather than requests But I generally like to give suggestions and hope his story gets written, then actually pay for a story and then end up not liking it... Now on to the prompt.
An island resort / hotel / couples retreat / adult summer camp / ECT. (Place vacation or work related place here)... or something like that where either everything costs normal prices but a kick to the balls from a staff member equals a specific amount of money off. Basically so if you want say a room with two beds it costs 300 bucks a night, or a spaghetti dinner costs twenty bucks, or pool access costs five dollars an hour, ECT. but each kick to the balls of any male in the party by a faculty member of any sort can get them a single dollar off. Then to make it a fairly interesting story maybe have it so a family / a couple / or even a company on a company wide vacation go to this resort for a week and only find out about the "discount deal" while they are there and if there's more than one man some of them can be willing and others be not willing.
Preferably if his story is written I would rather it be kept BALLBUSTING so NO CASTRATION (if "no ruptures" isn't your thing maybe settle for a halfstration or two?)