After a long day, Sonic and Tails decided to call it a night of adventuring.  "This looks like a good spot to set up camp!"  Sonic proclaimed as Tails followed behind him.
"Yeah!"  Tails responded happily, if a little tired.  "We can put our tents there and make this into a firepit."
Sonic kinda had to pee, but he decided to set up camp first.  It didn't take long to set up the tents and a basic firepit.  Before he knew it, they were both wrapping up and Sonic could go do his business.
"Alright, camp's set up!  Now I gotta take a leak, hehe."  Sonic chuckled as he looked around for a good spot to relieve himself.  He eyed the clearing where the river flowed by and decided that was a good spot to do it.  They'd picked this spot because of the nice view of the water, anyway.  That, and they could fish here, too.
"Heh, okay.."  Tails replied as Sonic walked away.  He hoped Tails didn't mind - he just really needed to pee right now.  He stepped up to the edge of the river and quickly unbuckled his belt, but he paused when he heard Tails say something.  It sounded really soft for some reason?  Like Tails was really shy, but maybe it was just because of the river loudly flowing by.  "Mind if I go, too?"
Oh, so Tails needed to pee, too?  He wondered why he asked for a second, but then he noticed how small the clearing was.  If he needed to go as badly as he did, they'd have to stand right next to each other.  Sonic didn't mind, though - he wasn't shy.  "Course not, little buddy!"  He heard Tails giggle in response.  Must have been because he said "little".  That was his term of endearment for Tails, and he'd say it if he was trying to ease Tails's nerves, too.
The fox walked up next to him and reached for his belt.  As he did that, Sonic unzipped and pulled out what felt like a bursting pipe right now..  Not a second after his penis slipped free from its cage, he let out what he'd been holding in for a while.  As he relieved himself, he looked out over the river, taking in the view and -..  His thoughts were interrupted by Tails quite loudly sighing in relief.  Sheesh, he must have needed to go even more than he did!  He shot his friend a glance and was about to tell him he could have asked to stop sooner, but something caught his eye.
Wow!  His "little buddy" wasn't so little downstairs!  He hadn't seen Tails's penis in so long - but boy did puberty hit his friend like a freight train!  He was still smaller body-wise, but..  Tails's penis was easily bigger than his, even if he didn't account for height ratio.  He couldn't help staring as his stream died down, but Tails seemed completely oblivious.  Sonic kind of wanted to congratulate his friend, but he didn't want to embarrass him, either.  Sonic put himself away as Tails was still finishing up, but he stayed where he was, looking out at the river again, and still debating whether to say something to Tails.  He REALLY wanted to, but he hesitated.  Why was he staring?  Sure, it was impressive, but sheesh..  Once Tails was covered up, he looked over at him and was just about to say something, but Tails did first.
"Hah!  Were you watching me pee?"
Whoops.  He could have waited to look at him until Tails had turned around..  "What??  Haha!  No!"  Wow, smooth lie..  "Ok, yeah, I looked, sorry..."  Well, this was as good a time as any to bring it up, but he decided to just joke about it.  "But I mean, how could I miss THAT thing?  Hah!  You're really packing down there!"
"I... what?"
"...you know.."  Tails had no idea what he was talking about, did he?  Great..  "..you really grew a lot down there, buddy...  I'm saying you've got a..  big penis.. for your size.."
"I do?"  Tails seemed dumbfounded.  Tails must not have known..  Sonic nodded nervously - this was kinda awkward, but thankfully Tails broke the silence,  "...how big is it?"
"Heh.."  How should he answer that?  It's not like he measured it..  Maybe the best way was to just compare?  Wait, he trying to come up with a ploy to see Tails's penis again?  He kinda did want to see just how big he was, though..
"Wanna compare?  ..Heh, I guess it's only fair if you get to see mine, since I saw yours."  Only fair, right?  Heh.  He could tell Tails was nervous.  He probably didn't want to show him again.
"Okay.."  Tails answered timidly and looked away.  He saw a smile form across the fox's face, though.  He could tell he didn't mind - he was just nervous.
Sonic chuckled.  "Hehe, alright!  We'll whip them out at the same time, okay?"  He figured this was the best way to do it.  Tails probably wouldn't want to show first, and if he showed first, Tails might be too embarrassed to follow through.  Maybe this would make Tails less nervous, too.
"Hehe, okay.."  Tails seemed to be working on that already, so Sonic started undoing his belt as well.  He got to where all he had to do was tug on his boxers, and waited for Tails.  Once Tails was ready, he counted down.
"On three.  One.  Two.  Three!"  He tugged his boxers down, and Tails tugged his underwear down right after.  That monster sprung to life immediately, sheesh!  "Whoa.."  It was as if he'd already forgotten how big it was.
"Heh.."  Tails chuckled as he looked at Sonic's junk.  Just a nervous chuckle, though.  Tails wouldn't make fun of him.  But.. speaking of springing to life, Tails's penis started to perk up.  Poor guy was probably just sensitive down there.  He'd been nervously rubbing at the area in anticipation of the reveal.
"Hey, no fair!  We can't compare if only one of us has a boner!  Hehe.."  He saw Tails start to cover up in embarrassment, but he spoke quickly.  "Whoa, hey!  It's okay!  You're probably just sensitive down there.  Here, I'll stroke mine a little so we can properly compare!"  Sonic stroked himself for a moment until he was just about fully hard.  That should be good enough.  Besides, Tails wasn't completely hard eit-  ...and nevermind, Tails was stroking his, too.  Guess he thought that what he was supposed to do.  Tails stroking himself actually turned him on a little, so at least that would do the trick.  Sonic knew he was attracted to guys sometimes, but never really thought of his friend like that...
"Heh, okay, now let's compare."  Sonic walked a little closer to Tails and held his up.  Sonic had measured himself before.  He was a little above average.  About 6.5 inches fully erect.  Tails held his up as well and Sonic looked at it a little closer.  Man, he's really gonna make a woman happy some day..  "Looks like you're about 7.5 inches or so.  6 inches is about average.  Who knows, maybe you'll grow a little more?  Heh.."
"You think so?"
"Yeah, maybe!"  Sonic's eyes hadn't left his friend's dick since it popped back out..  Maybe he should stop now before Tails gets too weirded out.  "Well, anyway..."  He tried to think of something they needed to do.  "Wanna catch some fish?"  That would give them something to do to take their mind off of all of this.  Sonic quickly put himself away.
Sonic turned to get the fishing equipment, thinking to himself that he really needed to masturbate tonight.  Maybe he'd use the image of his friend's huge cock...  Tails interrupted his.. strange thoughts again.  "Uh..  Sonic?"  He stopped and turned his head back toward the fox.  Sonic didn't forget something, did he?  "Uh...  Can we compare..  o-one more time?"  Huh?  He...  His dick was still out, and still hard as ever.  Well, so was his...    "...I did...  didn't get a g-good look at it.  Uh...  I just wanna measure one more time, heh..."
Sonic turned the rest of his body back toward the fox.  What was he supposed to do?  Say no?  "Uh, s-sure buddy!"  He noticed Tails started stammering, and now he was, too.  Was Tails attracted to him?  Maybe not..  Maybe he really was too busy being nervous that he didn't even look.  Sonic wouldn't know - his eyes never left Tails's dick once he pulled it back out.  This was kinda turning him on now, he found himself staring again, but he managed to play it cool.  "I was wondering why you weren't covering up, heh!  Make sure you get a good look this time, okay?"
"Heh, yeah.."  Sonic started pulling it back out.  As he was reaching for his zipper, he sneaked another look at Tails's cock, making his own dick throb.  He was definitely attracted to his best friend...  As he whipped it back out, they both shared a brief smile at each other before his eyes drifted back down.
"Okay, ready."  Sonic decided to see if Tails would take initiative this time.  Sure enough, he did after a second.  Tails moved forward and held that big pole up in front of him.  Sonic made sure he didn't stare so much this time.  He wanted to make sure Tails was looking - but somehow he already knew.  He noticed Tails was trembling.  Tails definitely got a good look already.  Sonic just smiled and waited.
"Can we...  hold them against each other?  So I can.. measure them better?"  Sure, Tails.  So you can get an "accurate reading".  Sonic decided to play along, though.  He knew what Tails wanted, and he was more than happy to oblige.
"Go ahead."  Sonic said it very simply, but he knew even Tails noticed he said that very softly and his voice wavered a bit.
Tails placed his big cock right up against Sonic's and...  "examined" them.  He could feel Tails's dick twitching at the contact, and he smirked in response.  Tails was really enjoying this.  Oh but who was he kidding, he was too.  He was starting to twitch as well.  Suddenly Sonic bucked his hips before he even realized what he was doing.  Sonic was pleased to hear Tails's moaning in response.
After a moment, Sonic broke contact.  The tips of their dicks were still attached by a strand of precum.  Sonic knew what he wanted tonight.  What they both wanted.  He started to put himself away again.  "Get a good look that time?"
"Y-yeah..."  Tails chuckled nervously.
"We should probably stop, just in case someone sees us."  He paused for a moment, dramatically.  "But if you wanna compare some more, we can do it in my tent.  There's plenty of room.."
Tails became so immediately flustered by that.  He even curled his Tails around him, acting all shy.  Sonic just barely made out a subtle, knowing smile on Tails's face.  That fox knew what he meant - well enough, at least.