what if i hypnotized you to connect your cock to your bladder
when your bladder is completely empty, you're fully soft. when you feel the first twinges of needing to pee, the blood begins to rush to your genitals. your cock starts to feel a bit heavier and makes a slight bulge against your pants. as your bladder fills, your cock continues to harden. by the time you would normally use the bathroom, you're half-hard and strangers are stealing glances at your pants tent. but here's the catch: if you want to pee, you're going to have to cum first.
if you go to the bathroom now, you'll stand in front of the toilet coaxing your cock to full hardness and stroking yourself until you manage to make yourself come. doesn't matter if you're in public– if you want to empty your bladder, you're going to have to masturbate and hope no one notices you pleasuring yourself in a public place. but look out: as soon as your cock finishes shooting cum, it'll start leaking piss, and your bladder will drain until it's fully empty whether you like it or not.
of course, if you don't want to masturbate in public like that, you can choose to hold it as you make your way back home. but the fuller your bladder gets and the more desperate you become, the harder your cock will get. when you start to feel the need to squirm or shift in place to hold it, your cock is fully hard and straining against your pants, the strangers that pass you by are scandalized by the obscenity. the tip of your penis rubs against your pants with every step you take, coaxing out drops of precum. but be careful not to have an orgasm, or you'll start uncontrollably peeing!
your cock throbs as your desperation reaches new heights on your journey back home. since you haven't cum yet, not a drop of pee leaks out of you– everything is locked inside until you orgasm, both types of release tied together, so no way to let off any of the pressure. you fan your legs, hunch over, and even grab your penis like a child, all the while your cock is unbearably hard and swollen, aching nearly to the point of pain. you're overwhelmed by the sensations of approaching both an accident and an orgasm.
you squirm and pant as your pleasure and need to pee start to crest. you feel your balls tighten and your bladder quiver, full to bursting but unable to release until you release your cum. you feel your bladder contract and grip your penis tight, managing to hold back the flood for a few more seconds. your your bladder contracts again, and you think you're about to wet yourself, but instead, you start to cum. your cock starts to helplessly shoot cum without any stimulation other than the friction of your pants and the desperate grip of your hands, kicking and throbbing in your pants in a humiliating explosion of pleasure. as soon as your orgasm starts to fade, your cock still fully hard, you feel your bladder drop and release. a rushing torrent of pee floods out of your still-twitching, still-throbbing cock, your crotch drenched with cum and pee. you pee uncontrollably until you're completely empty, the last few spurts trickling pathetically out of your softening penis.
you could try begging me to reverse the hypnosis, but do you really want to?