Ok, I think I'll make it so you both need to feed each other.
"You wll now only feed each other by eating the poop in the back of each of your diapers, which will make you horny causing you to need to fill each others butts with your cum."
"And having a feed of cum will make you want to poop, it will be a never ending cycle. The smell of each others poop will make your want to eat it."
Jeff is the first to poop, and it immediately sets off Aidan. He pushes Jeff onto his tummy and untapes the diaper. It isn't long before he goes head first into the disgusting mess and starts licking away, he gets halfway through before the taste makes him horny.
He then pops open his own diaper and begins to mount Jeff.. It's not long before he fills Jeff's backside with load after load of cum. He tapes up Jeff's diaper leaving a bit of the mess left in the back.
Shortly after, he begins to feel the need to poop himself, and he quickly fills his own diaper.
Jeff feels the desire and pulls down Aidan's diaper and starts licking it up himself.
He is in love with the taste and works through fully cleaning Aidan's backside. He then grabs Aidan's diaper and tapes it over his own head before mounting Aidan to give back the favour whilst being surrounded by Aidan's mess.
Aidan grabs a new diaper from the pack and puts it on himself.
Liking the idea, Aidan rips off Jeff's diaper and finishes cleaning up Jeff, before putting it on his face to eat the last of the mess.
He feels the need again to mount Jeff and fill him with globs of cum.
This goes on for the rest of the day, each filling diapers and each other.
"Now for night time, you'll both be taped into the same diaper. The one on the back gets to hump and cum all night whilst filling the shared diaper. I will check you both half way through and swap you around."
"Each time you poop, your dick will grow a bit in girth and length and you'll be able to cum harder each time. It will reset at the end of the night once you stop wearing this shared diaper."
They are strapped in bed in their shared diaper, Jeff gets to be on the back first while Aidan gets to be filled.
Mark grabs a pacifier and dips it in one of Aidan's diapers and puts it in Jeff's mouth.
"Here we go this will help."
It doesn't take too long for Jeff to kick into gear and start furiously thrusting Aidan. He shoots out 7 thick shots into Aidan the first time, Aidan moans in pleasure and pain from the first pounding. It's not too long before Jeff fills the seat of his diaper with poop. As promised, Jeff's dick pushes it's way a little deeper into Aidan and gets tighter. Causing Aidan to help a little.
Aidan gets hit with the waft of Jeff's chocolate moose longing for it, but unable to do anything apart from accept Jeff inside him.
The extra tightness starts Jeff up again and he begins to pump Aidan before shooting out even more globs into his back.
Another half a hour passes and Jeff begins to pump yet again, filling Aidan a little bit more. Aidan begins to feel the pressure from all the seed build up inside, it's only a minor pain at the moment, but it causes Aidan to start to squirm every now and again.
This in turn excites Jeff again, and yet again begins to pump, but as he is thrusting he feels a rumble in his gut, he pushes out a bit more mass with the next thrust causing the dick to grow a bit more leading to more pleasure and another push of mess into the backside.
Jeff's dick grew three times in the process, causing Aidan to moan in pain with the final thrust filling him with more then any other load that night.
Over the rest of the night, Jeff poops twice more and fills Aidan 4 more times before Mark comes in to see how they got along.
"Hope you had fun Jeff, now it's Aidan's turn."
Mark lays Jeff onto his back, undoes the diaper and removes Aidan from him. He flips Jeff over, smushing his dick into the poop from earlier. Mark grabs a pacifier and dips it in Jeff's mess and puts it in Aidan's mouth.
As with Jeff, Aidan getting the taste of poop instantly causes him to become hard and fill Jeff's back, but the anticipation of smelling it the first half the night meant it only took a couple of thrusts before Aidan released the built up cum.
It was almost immediately afterwards the pressure in Aidan's back begins to give, and he drops his first stinky mass in the back.
Jeff yelps as Aidan's member gets bigger, but all the cum waiting in Aidan meant it was only a minute before he made even more of a mess.
He pooped 3 more times in a span of 5 minutes, his dick growing each time.
Jeff wasn't ready for such a quick expansion and yelped in pain.
The squirming turned Aidan on and began to thrust into the way too small hole he was now filling. It felt amazing and he started shooting out shot after shot, which caused him to poop even more, making his dick grow mid orgasm, he shot 15 loads in a single go.
The cum that filled Aidan certainly had an effect, he managed to poop 5 more times that night, and didn't know how he ended up so deep in Jeff.
By morning there he had unloaded an additional 8 times, easily beating what Jeff did to him.
"Ok boys it's morning, I'll turn Aidan around and you can both finish filling the middle of this diaper with your shared mess."
Aidan is taken off of Jeff and spun around so both their fronts get covered in the pooey mess they made during the night.
It's not long before Jeff needs to unload some of the poop from Aidan's work into their shared backside, it shooting way up both their backs. Aidan follows suit and adds to the warm mush.
"Now time for you to both have your breakfast."
Mark removes the diaper and puts it over their heads flipping it around so they each get to share each others mushy work.
They both thoroughly enjoy it, and Mark places something over both their dicks.
"We need some of your seed for today's activities, so I want you to both fill an entire bottle full to take to the new playgroup."
You are both cleaned up and put in fresh diapers. And when you get there you are taken to the