This is a continuation of the previous story I posted.  You could read it or start from here.

“Where are we going?” Kevin said shyly as he pulled up his pants from his waist.  He hadn’t chosen a good pair of swim trunks, apparently.  They were sagging and normally it wouldn’t have been a problem.  This time, however, he had been forced to wear a swim diaper due to some weird rules that the community center still had in place from the last time he’d been here when he was still in diapers.  As a high school student, it was incredibly embarrassing to be forced into diapers by an otter named Todd who was practically the same age as him.  More embarrassing than that was that his brother had found out about it and blackmailed him into coming with him and one of the neighborhood kids if he didn’t want people to find out.
“My house is right across the street from the pool,” the preteen otter said with authority, his head as he glanced down at the swim diaper which was peeking out from the top of Kevin’s shorts.  “You’ll like it.  Don’t worry.  I’m surprised that you’re actually Lars’ older brother…well, you WERE his older brother, right?”
“That’s right!” Lars said, gaily tagging along with his phone snatched firmly in his hands.  “He agreed that I would get to be the older brother all summer long in exchange for his pants back!”
“What does that even mean?” Kevin murmured to himself.
The otter’s ears perked up, as if he’d heard, even though Kevin hadn’t meant for him to.  With a smile, he proclaimed, “Isn’t it obvious?  Big brothers are in charge of their little brothers.  Little brothers have to do whatever their big brothers want.”
“That doesn’t really help,” Kevin thought privately.  The otter was still staring at him, though, and it almost seemed as if he’d heard him anyway, offering a wink as he pulled out a pair of keys and unlocked the door to a two-story home that was, as proclaimed, right across the street from the community center.
“What’s your guys’ name, anyway?” the otter asked as he threw open the door to reveal a decently sized living room with better-than-average looking furniture.
Lars excitedly spoke up “my name is Lars!  I’m 12 and my little bro’s name is Kevin!  He’s 17!  We’re new in town!  What’s yours?”
The otter balked at the statement.  “My name is Ethan.  Kevin really is small for his age, isn’t he?  I mean, I’m taller than him and I’m only 8!”
“Haha, yup!  My momm-  I mean my mom once told me that he wet the bed when he was your age, still!  He thought I didn’t know, but I asked about why he had a potty calendar like I did when I was really little.” Lars said with a giggle.
“Wow!  So he actually does need those diapers, after all, then!  Haha.  How pathetic!”
“C-cut it out…” Kevin stammered, blushing a deep red as he hunched over and lifted his pool shorts, “I haven’t wet the bed in like 8 years.  It’s just a dumb rule that the community center has…”
“Yeah, yeah.  So you say,” Ethan dismissed, “what do you think, Lars?”
“I think that we should keep him in the diapers, just in case!” Lars said excitedly, smiling along with his newfound otter friend.  “Can we come in?”
“Hmmm, sure!  Only one thing, first!  I have a surprise for Kevin, so I have to blindfold him!”
“Okay!” Lars replied. “Go ahead.”
“But-“ Kevin started.
“He’s your big bro, and he said it was okay.  Unless…you want to take it back?  You could start your first day of school as the baby wolf who needs diapers when we show everyone these pictures of you,” the otter said with a devilish grin.
“F-fine!  I’ll cover my eyes!” Kevin said with annoyance as he placed his paws over his eyes.
“Well…” Kevin heard the otter say briefly.  In that moment, his shorts had sagged down, so he barely noticed when the otter had pulled them down to his feet, then pushed him over onto his padded rump.
“W-wait!  We’re still outside!  I need those!”  Kevin said with a shock, covering his swim diaper with his paws and looking around to see if anyone had seen him.  So far, he didn’t see anyone nearby.
“Well if you want to come inside, you’d better follow my rules too!  I’ll be your big bro now too, and I say that you need to be blindfolded!” Ethan proclaimed as he tossed the shorts inside the house to prevent Kevin from getting them.  
Kevin’s heart was racing and there was a huge pit in his gut.  “Fine fine!  You can be my big bro too!  Just let me inside!”
“Okay!” Ethan said as he allowed the two wolves in quickly.  “Since you were bad, and didn’t listen first, though, you have to face that corner of the door until we get back!  You’re in time out!”
Kevin was just relieved at not being exposed anymore.  Although humiliated, he was learning not to mess with this otter.  “Can I at least have my shorts?”
“Hmmmm.  Nahhhh.  I don’t think you deserve them.  What do you think, other big bro?”
Lars giggled.  “Nope!”
“Fine…” Kevin harrumphed, facing the corner.  It’s not there was anyone around who hadn’t already seen at this point.  He imagined the otter’s parents couldn’t be home since there wasn’t a car out front, and he already knew that his older brother was the otter lifeguard, so he wouldn’t be home, either.
“Hehe, you really do like my baby bro when you’re pouting in the corner!” Lars said, stifling further laughter.
“He does, doesn’t he?” the otter was quick to join in.  “Come on, Lars.  I want to show you some stuff!”
Kevin did his best to not react to the statements, but his mind had subconsciously tucked his tail between his legs at the comment, only noticing that betrayal of his body after they had run off down the hallway.  Once he thought that they were gone, he took a quick peek behind him to see if his shorts or the backpack that Lars had when they entered were there, but saw nothing other than the lavish furniture of the home.  Drats.  
Seconds became minutes, which eventually became what felt like an hour.  Occasionally, Kevin would hear distant laughing, but not much else.  He tried calling out “how much longer do I have to be in time out?” but he got no response.  He didn’t much care about being left alone.  However, he hadn’t used the restroom since they’d left for the community center.  And while he’d normally be able to shut out the urgency, the fact that all he had to look at was the corner and his colorful swim diaper, his eye constantly darted towards the diaper, whether he wanted to or not.
He had to admit – he rather liked the feel of diapers when he was still wearing them as a kid.  These ones weren’t nearly as thick, and because they were designed for slightly older children (well…like 8 year olds) the designs weren’t nearly as childish – instead being a default print of racecars on a blue background.  He’d remembered what Ethan had said before they left the pool: that the racecars were wetness indicators, and would disappear if he’d actually gone in them.  Just thinking about peeing made him want to pee, and with a diaper on, that’s all he could think about.
“Should I just?  No!” he thought.  They would just tease him all the more if he used the diaper.  Once more, he called out, but had no response.  Within minutes, all he could think about was wetting himself.  Tail tucked, knees bent and jostling, and ears flattened, he did his best to hold back the flood.  Then a voice brought him out of his intense focus.
“Awww.  Poor puppy.  Do you feel bad about being a bad puppy yet?  Are you ready to come out of time out?”  It was the voice of the young otter.  He was wearing new clothes, as was Lars, and they were both smiling at him as he looked back at them.
Kevin hadn’t even realized until now, but he’d been whimpering decently loudly from the urgency.  In broken statements, he struggled to find the words, “Um-yes.  Bathroom?”
“Bathroom?  I guess we’ll show it to you, but you still haven’t been blindfolded.  Aren’t you 17?  You can hold it, right?” Lars said.  Kevin could hear from his voice that something sinister was there, but he couldn’t focus 
He unwillingly let out a louder whimper.  “Okay…just…please hurry?”
Lars giggled and hurried over to tie a cloth around his eyes.  Once blindfolded, Kevin felt a paw grasp his own and blushed at the feeling of helplessness that came from being led by the hand like a child.  With something to distract him, Kevin was able to renew his resolve, but the fact that they were going to the restroom specifically didn’t really ease the psychological need to urinate. 
It felt like they were messing with him.  They walked through a hallway and turned left.  He heard a door open, then another, and he was led through both.  
“Okay!  Here we are!” Lars said happily, releasing Kevin’s paw as he heard the door close.
Kevin quickly removed the blindfold, thinking he’d been had, and at first, that seemed to be the case.  He was in a closet.  Not just any closet…it was a closet full of baby stuff!  Diapers, baby clothes, toys.  Then he realized that he hadn’t been had…or at least, not fully.  Right in front of him at his feet was a child’s potty with a cartoon bear on it.  “Am I supposed to?” he said out loud, realizing very quickly that he didn’t have a choice.  He couldn’t pee in this thing!  That was the thought that ran through his brain as he lowered himself down onto the potty and tried to aim his penis down into rather unsuccessfully, getting it all over the potty, into his training pants, running down his legs, and eventually onto the tile floor.  “No!” he said loudly, even as the door swung open and he heard several clicks of two familiar camera phones, taking pictures as he soiled himself, the diaper, and everything else in a room full of baby things.
“Bad puppy!  You weren’t supposed to use that potty!  That potty is for babies.  I guess that must mean you’re a baby then!” Ethan said, laughing. 
Kevin had nothing to lose left at this point.  He was openly crying as he felt utterly humiliated.  He tried shifting to hide his shame, but he ended up just making his still heavy stream of urine splash.  He felt ashamed.  Here he was, a 17 year old, wetting himself uncontrollably in front of his preteen brother and an 8 year old otter than was easily overpowering and outsmarting him. 
“Maybe he is a baby!  I didn’t know little Kevin was THAT little!” Lars said, pointing at Kevin’s 3 inch cock.  “I think I was that big when I was 4 years old!”
“No kidding!  I’m at least twice that big now!” the otter said, still clicking his phone away.
At this point, Kevin couldn’t help but notice – the otter was sprouting a woody beneath his shorts.  It was obvious because he wasn’t lying a second ago…the otter was definitely more hung than him at less than half his age.  He looked away, his body burning in shame from so many feelings of insecurity and humiliation.  Slowly, through their verbal jabs, the stream subsided and he was left on top of a potty that had very little in it, surrounded by a very large puddle.
“Looks like he’s not potty trained after all, Lars.  What do you think?”
“I think our baby bro needs real diapers!  Not just trainers like he had on before!”
“N-no…” Kevin sniffled, still crying as he tried to bring the swim diaper back up around his waist.  It felt wet and warm and soothing, in a weird way.  True to the otter’s words, the cars were all gone now, too.  “Y-you made me wet myself.”
“You mean an 8-year-old otter made a 17-year-old wolf wet himself?  How’s that?”
“Y-you…” Kevin continued to sniffle, wiping the tears from his eyes.
“It’s okay, baby bro.  Puppies have accidents from time to time.  I’ll clean up your potty and Ethan will wash you up, okay?”
Kevin could hardly believe himself as he nodded, not able to formulate any other answer in his current circumstance.
His paw was taken more forcefully by Ethan…he was much stronger than he’d expect for a child his age.  Or maybe it was just that he was feeling so weak.  He was reblindfolded, then taken to a bathroom that appeared to be right near the entrance where he’d been in time out…figures.  He heard the bath water turn on, and didn’t complain as his wet diaper was stripped from him.  He didn’t dare take the blindfold off, even though it was taking the otter quite some time.  Through the noise of the bath water, he heard a strange buzzing noise, and began to flinch away, but a strong paw grabbed his mane and whispered into his ear “don’t struggle or I’ll spank you.”  With a whimper Kevin stood still as he felt Ethan’s probing paw guide the buzzing noise over his crotch.  Then, Ethan had swapped his paw to the scruff of Kevin’s neck, eliciting a primal whimper from the older wolf.  He sat in relative silence as he felt all of his adult hair being trimmed down.  When he was finally released, he was surprised to feel his soggy diaper come back up between his legs, a little colder than before.
“Here.  This is what a baby puppy should look like!” Ethan said as he removed the blindfold from Kevin.
Kevin’s eyes went wide as he saw himself in the mirror.  With his mane shaved down, he looked almost 3 inches shorter, especially as cowered down as he was.  In comparison, the otter looked much older than him, and much stronger.  Without as much fur to fluff him up, he looked like a weak little thing.  This said nothing about the obviously wet diaper between his legs.  If he didn’t know that this was himself, he would’ve guessed that the wolf before him was a 5-year-old.
Ears flattened, he looked over to the otter pleadingly and was surprised to see that the 8-year-old was completely naked and standing at full attention in front of him.  The kid was packing!  No!  He shouldn’t think that way.  His eyes darted away.
“Just what I thought.” Ethan said, with a hint of impishness.  “Get in!”
It didn’t take much.  Kevin quickly dropped his wet diaper to the floor and stepped into the tub, feeling thoroughly emasculated as he tried to hide his own erect, now hairless cock.
“Good puppy.”
Before he knew it, Kevin felt Ethan’s paws working over him, lathering soap over his hair, effectively blinding him once more.  He knew that the otter was directly in front of him, standing over him inside the tub…which meant…
Surely enough, he felt that cock brush up against his mouth.  Kevin had given a blowjob before.  Well, once before.  It was to the quarterback of his previous school.  It ended up not working out, but he’d enjoyed that experience.  When he felt the soft organ against his face, he felt the urge to open his maw but quickly remembered that this otter was half his age.  
“I know you want it…you’re practically cumming already,” he heard the whisper in his ear.  “You want to be dominated by someone half your age.  Deep down inside, you know that you’re a pathetic little bitch and you come closest to being a man by having one inside you.”
“What are…agh,” Kevin tried to protest, the otter taking that opportunity to shove his meaty rod down the wolf’s throat, soliciting a moan from the canine before he pulled it back out quickly.
“See?  I knew it.  I knew it since I saw you with a boner after my brother got finished putting a diaper on you.  Just take it.”
Kevin whimpered and began to utter a protest, but was still reeling at what the otter had done to him.  He was so confused.  So confused that he reverted to a submissive state, allowing the younger male to handle him as if he were actually a child.  So when Ethan grabbed his scruff, spread his legs, and began washing his crotch and tail, he thought little of it…up until the point that he felt a probing finger up his rear.
“N-no!” Kevin protested unconvincingly as he let out a thick sigh and pant immediately after.  All noise was abruptly quieted as felt something thick and rubbery enter his mouth, although he couldn’t tell what with all the soap in his eyes. 
“Just hush, little bitch.  And don’t you dare spit it you.”
Kevin felt the otter’s paw working his tailhole, even as the thick object was secured in his muzzle.  Moments later, he felt the small paw upon his cock, letting out a loud moan that would’ve spilled out the contents of his muzzle, had they not been fastened on by some sort of string.
“What are you worried about, anyway?  As tiny as your cock is and as weak as you are, it’s like I’m the older one, anyway.  Just take it.”
And with that, there was a quick thrust!
Kevin’s protests were quickly stifled by whatever in his maw, not that there were many.  The otter had prepped him surprisingly well and it felt very well lubricated.  The pain was gone almost instantly.  And very quickly replaced by pleasure as the otter rocked back and forth within him.  The young male’s paws were no longer on his cock, but Kevin still felt an immense pressure as if he were going to cum at any moment.  It felt so good, and he couldn’t help himself.  As the thrusts continued, he ferally pushed himself back into the otter’s thrusts, breeding himself onto his thick rod.
“I knew it.”
Kevin blushed, but he didn’t care right now.  It felt good.  Fuck it all, it felt good.  He wanted this.
As if the otter had read his mind, he suddenly stopped his thrusts.  He felt soft paws undo whatever was in his mouth, then wash the soap from his eyes, only occasionally humping forward, eliciting tiny gasps from the older wolf.
“You should be able to see now.  Look at me.”
Kevin obeyed, looking shyly at the otter who was even now buried deep inside him with his legs wide to either side.  His own tiny cock was pointed up at him, begging for release.
“Do you admit that you want this?”
Kevin nodded, even now subtly pushing himself onto that otter’s cock, as if begging for more.
“And you realize that I’m going to make you my soggy diapered little ‘baby’…’sitter.’”
Kevin nodded again, just as eagerly as last time.
“So you’re going to tell your parents that you found a summer job.  And that you’re going to be babysitting here along with your brother…even though you’re going to be the one in diapers?”
Kevin nodded, blushing fiercely.
Ethan looked frustrated, “then tell me it.  Don’t just nod.  I took the dildo out for a reason.”
Kevin balked, not sure what to do.  “What…what do you want me to say?”
“Tell me what you REALLY want.  Tell me what I already know.  Tell me that you want my cock.  That your cock is tiny.  Tell me that you’ll be a good little baby and wet your diapers because, after all, you’re just a puppy.  And tell me in your own words…or else I’ll stop making it feel nice for you.”
“N-no please!  I want it!”
“Then tell me what it is that you want!”
“I-I want your cock inside me!”  I-I want you to diaper me…and humiliate me…and fuck me!”
“That’s more like it.” Ethan said, suddenly raising up Kevin’s legs and renewing his frenzied thrusting.  Kevin panted heavily as he felt his balls tighten, getting closer and closer as his prostate was repeatedly hammered by the thick cock of the young otter.  “Cum for me, puppy.” He heard the otter say, and he obeyed.  Praying his semen all over his own chest and face.  Waves of ecstasy rushed through Kevin’s body as he was effectively being milked by the intense motions of his young partner.  Little dribbles of cum trickled from his tiny cock, as would be expected from the small package he owned.  
“Haha.  Did you even cum?   Let me show you how it’s done!” the otter proclaimed, pulling out In the midst of Kevin’s orgasm and pointing towards the wolf’s face, showering him in far more cum than the older wolf had produced.  
Kevin let out a gasp as he pulled out, feeling the vacuous space tighten back up, but feeling degraded at the otter’s words and actions.  Almost 15 seconds later, the otter dribbled out the last little bit of his fierce young orgasm…but he wasn’t finished.  A stream of yellow hit the wolf’s face and he whimpered, trying to shy away from it, but the otter anticipated this and grabbed him once more by the scruff, pulling him up to the stream and liberally marking the wolf all over. 
While it took a while, the stream eventually subsided, but not before the wolf was covered from head to toe in the otter’s piss.  Neither spoke a word as the otter turned on the shower and rewashed both of them.  Neither needed to say anything.  Kevin knew that he was trapped by his hidden desires and this seemingly strong otter, and Ethan knew that he had the older wolf in his clutches.
“Mine.  It’s a promise, little baby bro.  You said you wanted it, and if you don’t do what I tell you, I’m going to tell everyone.  Got it?”
“Okay…I understand.  I promise I’ll be good…but…how did you know…really?”
Ethan took a moment, seemed to disappear into his thoughts for a second, then spoke up.  “I guess you’ll figure out eventually anyway.  I’m a really horny 8-year-old.  One day, 6 months ago, I told my brother that if he didn’t paw me off, that I’d tell all his friends that he wore diapers.  Something changed, then…I could smell something in the air.  And I just acted on my own.  Before I knew it, I was inches deep inside his butt and he was begging for more.  Turns out that he’s just as gay as you are.  When I smelled you, you were the same as him…I mean, kind of.  When your brother took your swimming trunks and were humiliating you in the locker room, you were horny.  That’s when I knew that you and my brother were the same.  I knew that I could make you just like him, and you’d love it!”
Kevin just stared into space…that couldn’t be true, could it?  Could this 8-year-old really be that intuitive.  Wait?  That cute guy…his brother…wears diapers?
“Oh…yeah.  I guess that’ll be a benefit.  I’m sure Todd would love to play with you too.  At first, I was just going to get Lars to fuck my brother.  Who would’ve thought that I would find another toy to play with, myself!  Weird how stuff works out like that.”