How did you even come to realize wearing diapers gives you a stiffy? Were you one day just like.. I'm going to put a diaper on and BAM! Instant boner? You're a "grown" man prancing around in diapers because it gets your rocks off, how gross! Well, you're going to put that diaper to good use and make it all moist, warm and wet for me. You will then proceed to jerk off while wearing a diaper, whilst I humiliate, mock and degrade you for it. Go on, make a giant mess in that diaper!