(beginning talks about following up on the last fic, Sonic takes Tails home with him and shows him around)
(Tails has been thinking about peeing with Sonic again and holding it for a while, nervous to ask Sonic to go with him)
(Tails really has to pee, and finally Sonic gets up)
"Wanna watch another episode?"  Sonic asked hopefully.
"Y-yeah!"  Tails replied, straining a little from holding it in for so long.  He felt like he was about to explode!  He couldn't take it anymore, but he was still too nervous to ask Sonic to go with him.  Before he could say or do anything else, Sonic started getting up from the couch.
"Cool!  But it'll have to wait a minute, I'm gonna take a leak first." 
Tails's eyes lit up!  "(Yes!  Finally!)"  He thought to himself.  Quivering and trying his best to hide how badly he needed to go, he finally spoke up and hoped Sonic would let him come.  "Okay..  I-..  I gotta go, too!"
Sonic paused and turned back to Tails.  He was about to ask Tails if he needed to go, actually, remembering how much Tails seemed to like going with him.  Of course, he liked it too, and he was wondering how Tails would act this time, after being given permission to look.  "Heh, alright!  Wanna go with me again?"
Tails tried to hide his excitement and act like he hadn't been holding it for the last hour, at least.  He was starting to think he overdid it a little by drinking all that water..  "Sure, Sonic!"
"Hehe, c'mon buddy!"  Sonic made his way upstairs toward the bathroom, unaware of just how badly Tails needed to go.  Tails followed closely behind as they both entered the bathroom.  Sonic stood in front of the toilet and tugged the elastic of his shorts and boxers down, exposing his flaccid hoghood, though it lengthened a bit as he remembered how cute the little fox's penis was.  He wasn't quite sure, but Tails seemed attracted to him because of how stiff he was last time.
Tails's penis was stiff this time, too!  He could feel it pushing against the new briefs he was wearing.  He fiddled with the new belt as well, trembling because of how nervous he was and how badly he needed to pee.  His new briefs fit him snugly but comfortably, only not so much now that his foxhood strained against the fabric, although it was better than it rubbing against the inside of the fabric of his pants.  His thumbs quickly hooked under the elastic and tugged it downward, freeing his stiffy as it literally sprang into view.  Tails sheepishly looked over, feeling a tingle all over as he eyed the hedgehog's package dangling between his legs, then up to his face.  That weird feeling came back even stronger than before when he realized they were standing even closer to each other than last time, and were practically facing each other, sharing something much smaller than that big tree.  Their tips would have been close to touching if not for their difference in height.  Tails held his bladder just a little longer, waiting for Sonic to start going first.
Sonic chuckled under his breath, amused and a little excited at the sight of Tails's small, firm length bouncing back after being pushed down by the elastic of his undies.  So he really did get stiff from seeing his junk, huh?  They both looked up at the same time, having noticed each other looking.  Sonic just smiled at him, reassuringly.
Unable to hold it in any longer, Tails looked back down as he relaxed and finally let it out.  His hard little willy turned into a mini fire hose as a torrent of fox pee shot out.  His stream was so powerful, it barely made it into the toilet, splattering loudly against the bowl as he shuddered and sighed in relief, "Ahhh.."
Sonic, about to start going himself, froze as he saw his buddy's stream suddenly start out of nowhere and surge forcefully out of his tip.  Sonic held off for a moment and watched in amazement for several seconds as it didn't die down at all.  "Holy cow, Tails.." he said softly so as not to startle him.  "You really had to go bad, huh?"  His soft member started to rise and harden as he was getting turned on by such an impressive stream for such a little guy, and a cute little package to boot!
"Y-yeah.."  Tails blushed without looking away, afraid of messing up his aim, as much as he was going.
Without thinking, Sonic continued admiring the spectacle out loud.  "Your weenie is so hard, buddy, hehe.."
Startled and embarrassed by such a sudden remark, Tails's whole body tensed, causing his penis to twitch as he was still going.  His stream briefly shot past his target as a result, veering a bit to the side as he tried to aim again.  Some of it flew towards Sonic, hitting his crotch and leaving his length to drip a little.
"Gah!"  Sonic jumped as he felt his dick sprayed with his buddy's urine.  "Hey, watch where you point that thing!"  He exclaimed, mostly in a joking manner, although he sounded geniunely upset as he backed away and grabbed some tissue to dry himself off.
"S-sorry!  I didn't mean to!  Sorry.."  Tails trembled anxiously, afraid that Sonic was mad at him.  Although, that was kind of exciting..
"Hehe, it's okay buddy.."  Sonic quickly settled back down and laughed it off.  "I didn't mean to startle you like that."  He turned back around and simply held his penis, staying a step back, just in case.
(more here)
"Sonic.. you didn't even go.."  Tails was actually a little disappointed that Sonic didn't actually go with him, even though he felt like it was his fault.
"Heh, well you went enough for both of us!  You even went on me, hehe.."
"Sorry..  I just got embarrassed when you said that."  Tails's eyes wandered as he spoke, stopping at Sonic's crotch.  "..but..  Your wiener is hard, too!"
"Yeah, heh..  I guess it just does that when we pee together!"
"Hehe, mine too.."
They both stood there giggling, both a little embarrassed, and both feeling those weird tingly feelings.  Sonic knew what it was, and he could tell Tails felt it too, but he wasn't sure if he should say any more about it.  Ignoring that thought for now, he stepped back into place, about to start going.
Tails, feeling a little awkward, spoke up again.  "Well, I guess I'm done.."  He started to shake himself off a bit as he finished up.
Sonic watched his buddy's little dingaling bounce and wobble cutely as Tails shook it a few times, causing the last bit of pee to drip off his little hooded tip.  Sonic's fully hard hedgehog cock twitched at the sight as Tails put himself away.
Tails looked back up to Sonic, noticing him looking down, and blushed again.  "Oh..  S-should I  leave my.. wiener out?  Do you still wanna look..?"
Sonic chuckled at the offer, unable to turn it down.  "Yeah buddy!  Lemme see it.."  A little embarrassed as well, he joked, "It's my turn to pee on it after all, hehe!"
"O-oh..."  Tails only found himself blushing more again, but when he thought about it, he didn't really mind.  "Okay.."  He tugged his undies back down, exposing his foxhood again, stiff as ever.
Sonic was a little surprised at that response.  "Heh, just joking buddy, I won't do that to ya!"
For some reason, Tails felt a little disappointed.  "A-are you sure?  You can if you want to.  I mean..  I peed on you a little.."
"That's alright buddy, I.. uh..."  Sonic paused, wondering if Tails actually liked that.  "..do you want me to?"
"Well.."  Tails paused for a moment, looking down and fidgeting nervously.  "Maybe a little..."
Sonic, misunderstanding what he meant by 'a little', joked again.  "Just a little?  I got a lot in here, hehe!"  He waggled his dick and pointed it at the fox playfully, as if emphasizing his words.
Tails watched the hedgehog's length flop around and point right at him, making him tremble all over.  "Heh, yeah.."  He thought back to when they were peeing on that tree before, remembering how much Sonic was going, and then imagining that big stream coming out right now, pointed at him.  It sounded kinda gross, although somehow exciting at the same time, but..  "Wouldn't that make a big mess, though?"
Sonic replied with a chuckle, surprised again at Tails's response.  He really seemed like he wanted him to do it now..  "Heh, yeah it would."  Getting hornier by the minute at Tails's reaction, Sonic started to consider it, but it still seemed a little crazy..  "Just a little, then?"
"Okay.."  Tails blushed and watched Sonic point his tip downward before following its direction to his own package.  He imagined it dripping off of his tip like his own pee would, and landing safely in the toilet, but too much would start to make a mess all over the bathroom, unless..  "..or we can do it in the bathtub!  That way you can pee a whole lot and it'll go down the drain!"
Sonic paused for a moment.  He was right - it would easily rinse away after he was done.  "Uh..  I guess...  Are you sure?"
The fox's tails wagged excitedly as he moved towards the tub, a little proud of his idea.  "Y-yeah!  It sounds fun!"
Sonic chuckled at Tails's enthusiasm.  "Heh, well...  Alright!"  Sonic turned and followed him closer to the bathtub, eyeing the fox's clothes.  "Ya might wanna take everything off, though - wouldn't want to get your new clothes all wet!"
Tails already knew that, of course, but hearing Sonic say it made him blush.  Seeing as both of them were already topless - and usually were - removing those would leave him completely naked.  "Y-yeah..  Will you get naked, too?"
"Sure buddy!"  Sonic was already starting to strip as those words left the fox's mouth.  His hands quickly tugged on his shorts and boxers, letting them drop to the floor as he effortlessly stepped out of them and kicked them to the side, giving him room to pull off his socks.
Tails couldn't help but look at Sonic's feet, seeing them bare for the first time.  For some reason, they looked really cool to him.  He'd never seen hedgehog feet before, and they looked a bit different from his own paws.  Sonic had already seen his paws, since he hadn't worn socks before, but he still felt embarrassed being completely bare with Sonic like this.  Nonetheless, he joined Sonic in his nudity.
Sonic watched Tails strip after him, much slower than he did.  The slow removal of his belt caught his eye first, almost like it was a show for him.  Tails gently set his belt aside and slipped out of his pants and socks, leaving his briefs last.  For a moment, Sonic wished he'd pulled them back up first so he could see his little dingaling bounce again.  In fact..  "Hey Tails..  Would you pull those back up for a sec?"
"Huh?  Okay.."  A little confused, Tails did as Sonic requested.
"Now uh..  Put your hands on your sides like this.."  Sonic placed his hands on his hips, where the elastic on his underwear would be.  "..and pull your undies back down like that!"
Still confused, Tails copied Sonic's instructions.  He stuck his thumbs in the elastic again, this time on the sides, and tugged down, causing the elastic in the front to push down on his length, more slowly this time.  Just before the tension became painful, the elastic slid off the tip, causing it to spring upward again.  He giggled a little at the sensation and looked back up to Sonic.  "Like that?"
"Yeah..  I just wanted to see it bounce again, hehe.."  Sonic idly squeezed his package as he stepped into the tub.  "You can take em off now, buddy!"
Tails chuckled, realizing himself that it was fun making it bounce like that.  "Okay.."  He let his briefs drop to the floor and kicked them off his foot as he followed Sonic into the tub.
Sonic held his penis, pointing it at the little fox, second guessing this whole thing again now that he was about to do it.  "Alright..  Ready?  You still sure you wanna do this?"
"Y-Yeah!  Ready, Sonic!"  Tails put his hands at his sides and leaned his hips forward, presenting himself to his hero and closing his eyes, not sure where Sonic would go.
"Okay...  Where do you want me to aim?  Just on your weenie?"
"Um..  anywhere, I guess.   Just.. maybe not on my face.."
(more here, Sonic pees on him)
(dripping wet with pee) "C-can I.. maybe go on you now?"  Tails asked nervously.
"Uh.."  Sonic wasn't sure how he felt about having the same done to him, but it did seem fair, and he figured he may as well try it.  "I guess so, buddy, since I just did..  You just went, though.."
Tails bounced on his feet, relieved at Sonic's answer.  "I know, but I drank lots of water earlier.. and it's been a few minutes.  I have a little!"
A little seemed fine, at least.  "Alright, big guy..  Just a little, okay?"
"Okay, I'll just go on your.. wiener..."  His own wiener twitched in his hand as he said that.  His heart quickened again, eager to try this himself!  He took a small step forward and thrust his hips out, pointing his penis upward towards the underside of the hedgehog's.  Since Tails didn't have much left in his tank right now, it would take a moment to start going, but it was tough not to get distracted by Sonic's hoghood.  The thick, proud length cast a shadow over the fox's smaller package, nearly obscuring it from view.  Tails trembled all over, eyeing the hedgehog's shaft as it throbbed in his direction.  It was so big and long, and so close to him, that he was practically kissing the tip!  For some reason, he suddenly wanted to do that now, but he focused on his task.  He took a deep breath and tried to relax, but when that didn't work, he tried squeezing on his bladder.  Tails let out a series of cute little grunts and fox noises as his little willy twitched every time he tried to force some out.
Sonic watched, enjoying the sight and the sounds the little fox was making.  "I think you're empty, buddy...  Maybe later?"
"N-no, just a minute!  I can pee.."  Afraid he might not get another chance, Tails kept trying.
"Okay.."  Sonic looked absently at the mess he made of Tails.  Even though it felt pretty good, as horny as he was now, he started to think he'd like to make a different sort of mess on him.  If he liked that, maybe he'd like getting covered in cum, too...
Tails finally started to feel something travel slowly up his length and relaxed as best as he could to let it flow out.  The warm, clear liquid dribbled down his little pink head and splattered against the bottom of the tub, then formed a small stream, flowing about an inch from the tip of his willy.  Not quite enough to make it to his target, the little fox stepped forward while he was still peeing, stood on his toes, and leaned in closer.  From this position, his stream was just strong enough to wet the base of Sonic's thick cock and cascade downwards, where it started flowing down to the blue-furred sack, leaving the hedgehog's balls dripping with fox pee.  Unable to keep himself completely stable on his toes, Tails accidentally touched penises and trembled at the contact, but he just kept going.  Since it excited him, and Sonic didn't seem to mind, he continued prodding it with his tip on purpose, twitching every time, until he was done.