Being able to upgrade or switch your lockers. Spending Coins to lower Doubt. I love the idea of double action in one cabinet.
Maybe some super curious girl opening a humping locker and getting dragged into. Or the lewd girl joining the action.
grabbing the exact same girl 3 (5?) times in a row leading to a bonus, like turning her lewd and have her more often around in lewd mode for the rest of the run.
With more lewd girls around, chances for spontanous girl on girl action in the hallway (the other girls may be shocked and flee, but won't raise doubt since there is no direct connection to the lockers)
Glasses, futanari/traps, sport dress, swimming suit
maybe an antagonist (school morale commitee girl?) which will attack a locker when she witnesses you grabbing a girl. Releasing the captured girl and damaging the locker, leading to reset of the locker (maybe after 3 times). Needs some strategy to conquer (maybe throw multiple lewd girls at her)
One question: what exactly is the function of the 10pt locker upgrade?