The banana game is a very fun toilet training game i originally developed to play with my female sub/Little, but really anybody can play that enjoys this type thing. The objective of the game is to fill your playmate's bowels with bananas and see how long they can hold them inside. You could also make this into a race/challenge, or play solo if you want.
What you'll need:
A large bunch of firm bananas. There is a delicate balance between firmness for insertion and softness for them to move through the curves and turns of the intestines.
Water based personal lubricant (K-Y)
Anoscope or proctoscope
Bisacodyl suppositories (ducolax, magic bullet)
Buttplug or dildo
Your playmate's bowels should be empty or nearly so. You should know their toileting habits best and can choose a time best for this game. Right after a BM is the best time. If they don't usually empty completely, you can give them a small plain water enema or fleet to clean out any remains. However, you don't want to give them a strong enema because you want their bowels relaxed for this game.
Fill a bowl with the liquid glycerin. Peel several bananas and cut them in half. Place the bananas in the bowl and let them soak in the glycerin.
Playing the game:
Put your playmate in the knee-chest position. Glove up. Lubricate the anoscope and their anus and rectum with some K-Y. Gently insert the anoscope and withdraw the obturator. Air should enter the rectum. Insert two or three glycerin suppositories (or bisacodyl for a stronger urge) through the anoscope, reinsert the obturator and slowly remove the anoscope. The suppositories are now emplaced at the depth of the scope you used (they'll be pushed deeper and deeper by the ensuing bananas).
Now insert a half banana, pointed end first. It should slide in fairly easily. They should feel it draw in past their internal sphincter. Repeat the process with the next half banana. The next few bananas should slide in very easily. After the 3rd or 4th half banana, you can use a dildo or similar to push them further into the intestines. I have a rigid flat ended dildo that I can insert in my play friend about 8 inches deep. This pushes the bananas deeper and makes room for more in her rectum and sigmoid. You could also experiment with a soft silicone toy to push the bananas to an even greater depth. Keep inserting bananas until no more will go in. They should be very full with bananas at this point. You can use a butt plug, rolled up panty liner or tampon to plug the anus and rectum if you want. Diaper them if that's part of your play.
Now the fun begins. The suppositories and glycerin will start doing their job and the intestines will start protesting against their irritant action. The bananas start to liquefy a bit and the sugars released add to the fun. At some point, the urge will become uncontrollable and a big mess will be made. How you end the game is up to you. Play for best retention time if you want, or they “win” if they retain for a given amount of time. My little enjoyed being obstinate about her toilet training and tried to retain as best she could, and I always enjoyed watching her try to fight the effects. If they start winning the game too much, you can up the ante with marshmallows between the bananas or bisacodyl. Anyway, that's it. I hope you enjoy playing.