It wasn't the isolation of the dungeon that got to him. It wasn't the lack of light. It wasn't the bars separating him from his freedom. It wasn't the shackles binding his wrists together, nor was it the muzzle strapped to his face. No, it wasn't even the fact that his whole plan had gone awry and he know had to deal with the consequences of his betrayal.

No, it was the pressure off his bladder.

It was the fact that after only ten minutes alone in the dungeon he already desperately needed to release his bladder.

It was that at any moment he would wet his pants.

With his hands shackled behind his back he had no way of pulling down his trousers and relieving himself in the corner. As barbaric as the thought was it was much less humiliating as what seemed inevitable.

He stood, in the custom Asgardian prisoner uniform- a black smock and a pair of ratty trousers, in the middle of his cell. For he believed he'd relieve some pressure in doing so.

He crossed his legs, in frustration.

He was an Asgardian God. Born to be a king. He almost had all of Earth as his playing ground, but here he was, with his legs crossed like a child. Hoping in vain that he would outlast the need to pee.

He felt like a child. Left alone for 10 minutes, and already he was already about to pee in his pants. No, a child wouldn't wet himself like Loki was about to. He felt like an infant. Totally helpless. It enraged to think of himself like this. And it was all Thors fault.

He had locked him away in this dungeon. "I'm sorry brother", Loki replayed the monologue in his mind, "I wish it could have been another way".

Loki cursed his name. Loki cursed his bladder for being so undeniably weak. He cursed himself for being so weak.

Sweat rolled off his forehead.

It wasn't a new problem. Loki had experienced this since childhood. Often he woke up next to Thor in the bed they shared with wet sheets, and often he wet himself during their leisure time around the palace.

It was Thor who had always helped him clean and hide his accidents, and it was Thor who had suggested Loki start wearing diapers when the problem persisted til age eight.

Loki was humiliated by even the idea of it. Wearing diapers like an infant, when he was a prince. He would not dare risk the humiliation of having anyone find out. Or even the humiliation he would feel himself knowing he required the use of diapers to stay dry.

But when he found himself with wet trousers one day at an Asgardian celebration in the ball room he quickly changed his mind. Thor took off his cape and tied it around Lokis waist upon seeing his brothers pants drenched in urine, he took his hand and led him to their room.

"Brother, are you sure you don't want to wear a diaper?" Thor asked, as he helped his brother out of his wet trousers.

Loki blushed at the thought of it. "I suppose it might be better than wearing wet trousers around the palace..".

And so it began. Thor would sneak disposable diapers from the nursery or infirmary whenever he got a chance. The ones from the nursery were a little snug around Lokis hips, and only able to withstand one wetting comfortably.

At first Thor insisted on diapering Loki. He liked to look down at his little brother and see him lay there exposed and dependant on Thor.

Though Loki grew resistant to allowing Thor to help him on occasion he would give in, and allow Thor to change his diaper.

A diaper, that's what Loki wished for now.

As juvenile and humiliating it would be he wished he was wearing a big thick crinkly diaper. He would gladly get on his knees and beg for one at this point.

But he was alone, and his bladder was bursting. And he didn't have a diaper to protect him.

Loki was in pain from the pressure building on his bladder.

He relaxed his muscles for a second, before a small stream of urine escaped and he had to clench his muscles tighter. But it was impossible to hold it back now; all the urine he was holding back pushes it's way down. Suddenly he was wetting himself uncontrollably.

The warm feeling spread from his crotch to his legs, and the pitter patter of urine hitting the cold cell floor could be heard.

He moaned loudly at the pleasure of relieving himself finally.

It was almost completely pleasurable, until he realized he was standing there in completely soaked trousers reeking of urine.

He looked down at the mess he'd made of himself. Surely a guard would come eventually. He would soon have to be fed. And what would they find? A Agardian prince standing in a dungeon cell with urine drenched trousers. What an infant he was.

"Loki," said a voice.

He blushed furiously, he had hoped he may have had time for the urine to dry or at least have not been found out until hours later when he could use the excuse of having been made to wait to long.

He looked up. It was Thor.

Thor stood on the other side of the iron bars. He had obviously bathed since the battle. Though he still looked rough from it. In his hands he held a large bag, and a set of keys.

"Just as I expected", Thor said, looking at the large wet spot on Lokis trousers.

Loki tried to speak, but it was muffled by the muzzle. He wanted to explain himself.

"I know brother," Thor said unlocking the cell door. "I've brought you something to help".

Thor locked the door behind him. He put the bag on the floor and proceeded to open it up. He took out a large rectangle of material and lay it on the floor. He then took out a large disposable diaper, a package of baby wipes, a bottle of diaper cream, and a bottle of baby powder.

"They're allowing me to take care of you" Thor explained, and motioned for Loki to come closer.

How humiliating, thought Loki as he stepped towards Thor, a full grown adult, an Asgardian prince, must rely on his brother to change his diapers. He wanted to scream. He wanted to tell Thor to get away from him. He wanted to blame him for locking him in this cell with his wrists shackled, and without a toilet. But he didn't. He was at Thors mercy.His legs chaffed as he took the steps towards Thor.

Thor unlocked Lokis shackles, promptly put them aside, and proceeded to pull down his drenched trousers and remove his smock.

"Lay down," Thor demanded, motioning towards the material, which was now clearly a changing pad.

Loki obeyed, Thor had earned himself enough of his respect by removing the shackles for Loki to listen to him.

"Bottom up," Thor demanded.

Loki obeyed, and Thor positioned a diaper beneath Lokis rear.

Thor proceeded to wipe Lokis genitals clean, a procedure which made Lokis penis, much to his displeasure, begin to harden. Thor ignored it.

He continued to rub the diaper cream all around his groin, then sprinkles a large portion of baby powder on him.

Loki was surrounded in the smell of it. The total infantile feeling of having a diaper put on him by his big brother makes him blush furiously.

Thor taped up the diaper tightly, and helped Loki stand up so he could examine his work.

"Look at you," Thor sat patting Lokis crinkly diapered bottom, "You're my little baby brother again".

Loki avoided looking at Thor.

"My baby brother, who can't help but wet his pants when he's left alone" Thor said, cooing at his little brother, "Left alone for a mere 15 minutes".

"How ever did you expect to rule Midgard when you still need your big brother to diaper you?" he said as he patted Lokis crotch. "Had you enslaved Hawkeye so he could clean up your dirty diapers? You don't know how much I worried, baby brother, seeing you out there fighting and having to wonder if your bottom was covered in a rash, if you had someone to change your filthy diapers".

"In fact," Thor said as he reached into his bag and pulled out a baby bottle filled with milk, "I should demand they move you to the nursery where you can be kept with the other babies".

Looking down at Lokis red hot face his attitude softened. Loki had met his breaking point, and he didn't need Thor reprimanding him.

Thor unlocked the muzzle, and removed it from Lokis face. Before he could say anything Thor pushed the bottle into his mouth, "Stay quiet baby, just drink".

Quickly Loki gulped up the liquid.

"That's a good baby," Thor cooed.

Loki removed his lips from the nipple of the bottle. He crawled into Thors lap, with his head down avoiding looking Thor in the face. He leaned his head against Thors chest . Thor put an arm around Loki, and with the other arm offered the nipple to Lokis lips.

"Such a good baby," Thor said as he rubbed Lokis back and fed him the bottle. "Now, why could you not have stayed in Asgard? You have everything you need here".

Thor ran a hand through Lokis greasy hair. "Brother you need a bath".

And at that Loki lost it. He pressed his hair into Thors chest, and let out a loud sob. Tears escaped his eyes, and ran down his face. He was helpless to stop it, just as he had been helpless to stop wetting himself. He sat in Thors lap, completely naked expect for a diaper, crying like an infant.

"Big Brother," he said through sobs, "Don't leave me".

Thor put down the bottle and pulled Loki into a hug, "Never, Baby Brother, never will I let you go again".

Loki's head sat on Thors shoulder. "If you ever tell anyone about this, I will have to cut out your eyeballs and shove them down your blabbing throat" Loki said, trying to sound as intimidating as possible through the tears.

"I promise brother, this is our secret".