>>17161
Uh, I'll try and describe it, but there's no guarantee this'll be how it is for you. For me they're kinda a minor/major punishment depending on how much I actually need to mess(will get to that later). When one goes up inside I know that I'm *going* to poop my diapers and that it's just a matter of time. Usually after 20ish minutes I'll start getting minor bubbling and rumbles from my tummy that slowly increases to a genuine urge to mess. By 30 minutes I've probably had one or two waves of very strong cramps that I have to struggle to fight and keep my diapers clean. Usually sitting flat on a chair at this point to help hold it. Stomach is constantly noisy/not happy and I've probably had to risk letting some gas out to ease things. At some point from here on out the cramps will get too massive, forceful, and insistent to ignore and I'll lose control. I've gotten to where I can recognize about when I'll hit the point of no return and get down on hands and knees a couple minutes before hand, just because trying to keep from pooping your pants is a lot more fun with the extra challenge that position brings lol.
Anyway, diaper fills up, you get emptied, and this is where the rough part starts. Bisacodyl work to stimulate the peristalsis process(basically forces your bowels to contract and "push" everything inside, out). Trouble is, this'll keep happening even after you're empty. I usually have to deal with "after-cramps" where I'm essentially trying to poop nothing for 5-15 minutes after messing. Sometimes it's just a minor inconvenience, sometimes they're fucking brutal. Hence them really only being used as a punishment with me. Still, that should give you some idea of the process.
>>17169
Castor oil will absolutely make you mess and in spectacular fashion too. If you've ever done the magnesium citrate stuff, it has a fairly similar end result. You'll want to drink a fuckton of water because it works from the top down, effects last a fair amount of time, and it WILL dehydrate you otherwise. Initial VERY mushy, semi-solid mess, followed by an hour or two of off-and-on watery movements with practically no substance to them whatsoever. You'll probably want a diaper change somewhere in the middle unless you're looking to leak.