Do not try this if you are mildly allergic to bananas, you could have a bad reaction.
So I've been dying to mess my diapers for a while now, but I have housemates that makes privacy unpredictable. After seeing this in a adult art video, I thought about it for a week before trying it myself. I've only done this once so far, but I plan on doing it many more times.
You need: an enema bag(something for a deep-cleansing enema; a fleet won't do, some bananas, some lube, and your diaper. If you plan on sleeping in this, maybe some diaper rash ointment or something.
You'll need an enema bag and some time to do the enema, I'd give yourself an hour or longer. Use something bigger than a fleet enema, you're gonna need to do a deep clean for this, you'll also need some soap to do the enema with. Use about 1 teaspoon of grated bar soap per liter of water if you're unsure. You may be able to do this with only water, idk. I gave myself a 1.75 liter soap enema, massaged my guts really well, emptied the soap enema out and used a salt water-rinsing enema. You're clean once you see mucous and only mucous in the toilet bowl.
Freeze your bananas for about 30 minutes to an hour. They needs to be firmed up but not solid; I started with 2. Relax your butt with some butt play, using fingers or toys and lots of lube. Get a diaper ready and nearby, possibly under you now. Once you're as relaxed as possible, peel a banana, lube it up, and either start inserting it until you can't anymore and then break it off and turn it around and insert it tapered end first or break it in half from the beginning and insert the halves tapered ends first. Do this with as many bananas that is comfortable for you, and try to push them up far with your fingers. It will be a bit messy. Either discard the mush that doesn't cooperate, or try to insert it. Up to you. Once you're all full, put your diaper on! Holding it as long as possible, or expelling it immediately is up to you. Personally, I didn't have a choice when it started coming out, making it feel very realistic. I did have control over other parts of it, but once it hit a certain spot it came out on it's own.
It'll feel like the real deal, and if you've done your enema correctly will produce no real mess and you'll only smell bananas. It's fun, feels really good, and you can probably sleep in the mess without it affecting you!
I just wanted to share for those littles who really want to experience messing, but just aren't into it/can't bring themselves to do it/have a weak stomach and can't deal with the smell.