"You can masturbate, but you have to finish before this song is over."
The Barney theme starts playing.
It's only 53 seconds long...
You fly into a panic and start stroking your cock frantically. Trying your hardest to even get erect, let alone ejaculate. You're going crazy with the pressure of finishing in time. But it's not working. It's like you've never touched yourself before.
5...
You know it's hopeless by this point.
4...
3...
2...
1...
And just as the last note rings out, your hands are magically bound above you and you're being forced into a straitjacket. As the straps are tightened, you're stuck hugging yourself and your dick is still hard, pointing at the ceiling. You curse your inability to orgasm in the allotted time.
Your older brother kneels down in front of you and reaches for your balls. He squeezes them gently and licks his lips. "Did you really think it would be possible? After all the conditioning I did on you?" he says with a smirk.
He pulls back and stands up. Waving his hand, he conjures a thick magical diaper around your waist. It immediately closes around you and you're once again stuck in your babyish garment. The bulk is so much that you can't close your legs together at all.
"Time for your punishment," your brother announces. He then snaps his fingers and you're both in a dimly lit small room. You're now strapped to a padded table with your legs held bent in stirrups, exposing your diapered butt. A giant baby bottle appears above you, hovering.
As it is lowered to meet your lips, you read the side of the bottle. It says in large print, "PUNISHMENT LAX FOR SILLY RETARDS" and has a picture of Barney and friends on it. You gag as you realize what this means.
"Drink!" your brother orders.
You shake your head and resist, but then you feel your brother at your feet, tickling your toes.
"Awww, don't be such a sissy," he teases.
He's laughing as he wiggles his fingers along your arches, making your toes curl and wriggle. It's only a matter of time before the rubber nipple is forced into your mouth. You fight, but it's no use.
"You'll drink it," he laughs. "I'm your big brother. You have to obey me."
He tickles your exposed thighs and behind your knees unexpectedly. You burst out laughing, and with that the bottle is shoved into your awaiting maw. You gag and cough as you suck on the rubber nipple.
"Don't stop drinking or else it's tickle time again," he warns.
You gulp down the concoction woefully, your mind racing with fear and confusion.
After a few minutes, you finally feel the effects. Your belly gurgles and turns inside out. You feel like you're full to the brim with the milk, and with a single push, you're filling your diaper with hot smelly poop. You whimper as you feel the warmth spread in your diaper.
"Good boy," your brother praises you. "Now keep on drinking until it's all gone."
You nod obediently, gulping the magic laxative as you continuously mess your diapers at the same time. In one end and out the other.
As the last of the bottle is drank, you gasp for air and finish pooping yourself. The massive load fills your diaper and you can feel the mush being pushed around with every small movement.
"There we go," your brother says as he takes the bottle away. "Now, since you're a good little baby, you get a reward. A full night of edging and tickling!"
With that, he snaps his fingers and a vibrating wand appears in his hand. He points it at you and it hovers magically against your diaper front, teasing your cock with the vibrations. 
On top of that, a host of ghostly gloves appears above you descending as they make tickling motions with their spectral fingers. You squirm helplessly as you try to escape the onslaught.
"No escaping, baby," your brother laughs. "Just relax and enjoy your tickle torture."
Your older brother watches as the hands tickle your most vulnerable spots, and the magic vibrator keeps you on the edge of orgasm. You're panting and sweating as the hands continue to torment you. You're helpless and there's nothing you can do to stop it. You try with all your strength to escape, but you can only scream and laugh all night long.
After a hellish night of tickle torture, your diaper is somehow even fuller and you're drenched with sweat. You've been held captive for hours, and yet you're still hard. You can't believe it. You're getting off from being tortured. You feel your dick throbbing and leaking pre-cum.
Your older brother suddenly appears at your feet again, laughing hysterically. "Well, well, well. Look who's got a boner! I guess you liked my tickle torture."
He rubs your hard cock through the cloth of your diaper. As if you had a choice.
"It's time for a change..." You get your hopes up for a diaper change. "...of scenery!" Your brother finishes dramatically.
With that, he snaps his fingers and the room disappears. You're now standing on a wooden floor, dressed in what resembles a clown's outfit. Although your diaper is still very full and very exposed.
You pad around the room in your socks, trying to figure out what's going on, when suddenly a blinding light shines down on you. You squint and shield your eyes, but the light doesn't disappear.
You look around you again and realize that you're on a stage as the audience roars with laughter at your surprise.
"Welcome to the show, baby!" your brother announces. "And you're the star attraction!"
You look down at yourself again and groan in defeat seeing the humiliating outfit in all its splendor.
You're wearing a blue and yellow striped top with suspenders fastened to your diaper, cartoonishly large white gloves, silly striped knee-socks, and a comical hat with rabbit ears poking out of the top.
In that moment, you feel your body moving on its own and you begin doing simple silly dances. You internally scream as you lose control of your movements.
"That's right, baby," your brother laughs. "You're here to entertain us!"
A smile is forced across your face and you start marching in place. Your diaper crinkles loudly with each high rise of your knees. You're dancing like a child.
Feeling the magic being used on you, you struggle against it to no avail. You begin laughing yourself while you are forced to continue dancing.
Your older brother begins to sing. "Who's a good baby? Who's a good baby?"
You can only nod and smile as the audience cheers.
"Wiggle your butt for us, baby!"
You turn around immediately and squat down, wiggling your butt toward the crowd. Suddenly you loudly poop your diaper, and it sounds as if there was a microphone pushed against your backside.
The audience is hysterically laughing and clapping.
"Do it again!" someone shouts.
You bend over again and fart. Again, the audience laughs and applauds.
"Good boy!" your brother says. "Now tell us about it!"
You gag as the words are forced from your lips. "I made BIG POOPIES!" you yell out.
The audience erupts in laughter.
"That's right, baby!" your brother exclaims. "You made big poopy!"
You're unable to stop yourself from giggling and you begin bouncing up and down.
"I'm a stinker! A big retard!" You clap as you continue farting in your diaper.
Your older brother holds his sides as he laughs. "Oh my god, you're hilarious! You're so cute!"
The audience loves it and cheers louder than ever. They love your embarrassment.
You finally take a bow, and as you bend down, the biggest fart yet erupts from your backside. The crowd goes wild and laughs their hardest. Rather than roses, though, the audience starts throwing socks onto the stage at your feet.
You plop down onto your bottom with a squish and allow the socks to land all over you. You're covered in colorful socks and you can't stop laughing. You look like a total retard.
"Wrap it up, dummy. You have to run home now!" Your brother yells to you.
The audience bursts into applause again. You stand up and salute them. Then you walk off the stage, completely humiliated.
As you step behind the curtain, you're in your own living room. Still in a stinky diaper but at least the clown outfit is gone. Your brother is waiting for you.
"Well, well, well," he says. "Look who decided to show up."
You stare at him blankly.
"You were supposed to be here an hour ago," he says, in-character. "I think you need to be punished for breaking curfew, young man!"
He snaps his fingers and the floor opens under you. It's a small tube-like opening in the floor, barely big enough to fit you standing with your arms to your side. You fall into the darkness below, knowing that there's no way out.
You're trapped in a dark hole, your heart pounding with fear and anxiety. You look up an meet your brother's gaze. He's standing over you, grinning evilly.
Again he magically waves his hand and a deluge of smelly socks pours into the hole on top of you. You can't help but gag and choke as you're buried in smelly socks. 
"Have fun in the socky dungeon, baby!" your brother cheers at you.
As if that would have been enough. The ghostly hands from before returned to torment you in the claustrophobic space. Their fingers tickling you mercilessly, making you laugh and sob.
The hands again seem to know your most ticklish spots as they torture you. You can't move even an inch to escape their touch. They tickle you everywhere: your toes, your arches, your feet, your calves, your thighs, your stomach, your chest, your neck... Everywhere.
The magic vibrator buzzes incessantly against your erection, keeping you on the edge of climax for what seems like forever. You feel like you could finally really go insane this time. You're losing it.
Screaming and shaking, you fill your diaper even more. Was this the end for you? Suddenly a slit opens in the side of the tube at your eye-level. You can see a video screen in front of you.
On it, you see Barney and Friends playing. It's looping complete episodes of the mind-numbing baby program. Instead of the normal audio, though, you hear a cacophony of farting sounds and teasing laughter in the background, taunting you.
The silly cringe audiovisual experience plus the other tortures are too much for you. Trapped in the dark hole with no escape, your mind snaps and you begin uncontrollably laughing.
You can't stop laughing and crying. The tears are streaming down your cheeks and you can't catch your breath. You're in agony and yet you're laughing. Stuck wetting and messing your diapers. Being tickle tortured. Buried under a pile of stinky smelly socks. Forced to watch cringe Barney.
You will never escape. You will never cum. This is the end. Or maybe the beginning. Of your eternity of humiliating torment.
You can only hope that your brother will take pity on you. Probably not though!