Gassy Tails
Ch. 2: The Night After
Sonic skidded to a stop when he got back to Tails's place. He had agreed to hang out until Tails got back from his date with Cosmo. Sonic was positive Tails wouldn't be coming back home so he was surprised to find the lights on when he came back from a run. Sonic slowly entered Tails's house to the sound of some sappy love song. Sonic walked into the living room to find his buddy Tails sitting on the couch and watching a cheesy romantic movie. Tails was too busy shoveling ice cream in his mouth to notice Sonic had walked in. Sonic could see Tails's cheek fur matted with tears before his tails flagged.
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"Quiet you!" Tails whined with a mouthful of ice cream. He was still not happy with his butt. Sonic caught a whiff of fox gas that was so bad he started coughing. 
cough "Oh, man!" cough. Sonic exclaimed.
gasp "Sonic! I-I'm so sorry. Didn't see you there." Tails said, frantically fanning a hand behind him. 
"Haha, That's okay buddy." Sonic said while coving his nose. When the smell was gone, he sat down in a nearby chair. "So, I guess the date didn't go well?" Sonic asked. 
It took some doing, but Sonic finally got Tails to tell him what happened on the date. Tails was embarrassed at first, but Sonic got him to see the comedy of the situation. After a while, the both of them were laughing together.
"Hahaha, thanks for making me feel better, Sonic." Tails said. His tears had dried long ago and now he was happily finishing his fifth tub of ice cream.
"No problem bud. I'm just glad you didn't keep farting. I wouldn't have been able to stay awake." Sonic replied, chuckling. He then yawned. "It's pretty late, you mind if I crash here?" 
"Sure thing. You can take the guest room." Tails said, through a yawn. "I think I'll go to bed too. Goodnight, Sonic."
"Night, Tails." Sonic said. And with that both mobians went to sleep.
A Few Hours Later
Sonic tossed and turned in frustration. He had been trying to sleep, but he couldn't stop thinking about Tails farting earlier. The sight, the smell, and how embarrassed Tails was, all made him feel...funny. That was evident by the stiiff maleness between Sonic's legs that would not let him rest. This had been happening more and more to the blue hedgehog. He'd lost count of the amount of times he ran off to cover up a sudden boner. At 16 years old, Sonic knew this was normal for puberty and he also knew how to fix it, but that wasn't what was bothering him. 
A fart? Really? Sonic thought as he looked at his throbbing shaft. This was the last thing he expected to get excited about. He rolled over again to try and fall asleep when the walls started shaking like crazy. The vibrations caused Sonic to fall from his bed.
THUD
"Ouch! What was that, an earthquake?" Sonic asked as he rubbed his sore butt. Then he remembered he was in Tails's house and needed to check on the young fox. Sonic got up and sprinted to Tails's room. Luckily the shock and stress softened Sonic's member just in time for him to open Tails's door. 
"Tails are you o-Whew!" Sonic was interrupted by a of eggy gas that assaulted his nostrils. The hedgehog enjoyed th smell for a moment, looking over to see Tails's plump butt peeking out from under the sheets. Sonic blushed before going over to Tails.
"Tails?" Sonic asked softly. Tails still sound asleep, but he didn't look the most comfortable. In fact, his face was scrunched up in pain.
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Sonic's ears perked up at the sound coming from Tails's tummy. At that moment, Sonic knew Tails still had more gas to get rid of. Now, Sonic had a choice. He could tuck his buddy in and try to force himself to sleep again, or he could take this opportunity to explore his newfound desire. His erection returned to show approval of option two, so against his better judgement Sonic listened.
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Tails moaned in his sleep as the gurgles got stronger. Sonic followed the gurgles as they moved through Tails's body. He positions himself right behind Tails's....behind and waited for the inevitable. Tails's cheeks tensed for a moment and then.
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Sonic was once again engulfed by the smelly discharge, only it was stronger because of how close Sonic was to the source. Not that that the Hedgehog minded, he happily sniffed up the eggy scent and even went as far as to bury his face in between Tails's cheeks. Luckily, Sonic's actions didn't wake the sleeping fox and actually drew more farts out of him.
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Sonic's nose felt Tails’s hole open to release more gas and this time he could smell a hint of spice along with the eggy smell. He chuckled a little at that. remembering Tails said he had chili earlier. 
I wonder how it tastes. That thought surprised Sonic greatly. Chili is his trademark favorite, but this was a little much. Or at least it was until his cheeks grew pink when Tails grunted again.
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Sonic was once again bathed in Tails's gas and sniffed up the meaty stink. He was in such a euphoric state, he threw caution to the literal wind and slowly swiped his tongue across Tails's pink star. Sonic ears perked at the slight moan from Tails that encouraged his licking. As Sonic kept eating Tails out, he enjoyed the taste more and more, it was spicier than he expected and carried some of the fox’s own brand of musk. A musk that was amplified when Tails farted again.
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Sonic was in heaven as he the egginess of that one. He closed his eyes as he kept licking and moved his hand between his legs to help his weeping boner. He knew it wouldn't take long for him to cum and got more excited when he heard Tails's tummy give an ominous rumble.
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As Sonic got ready for what sounded like the finale, a random thought occured to Sonic. I wonder what he's dreaming about.
Tails in Dreamland. 
Tails was currently reliving the worst night of his life. However, this time he butt lost all control and kept blowing up the room. Cosmo and the waiter kept laughing and pointing at the poor fox as he offered another weak apology. A strong gurgle from his tummy made Tails really nervous, especially since his tailhole felt really wet. He went into panic mode as he realized he was about to make a mess of his chair, so he quickly grabbed at hat off the nearby coat rack and put it under just in time for his bowels to explode.
Back in Reality
Tails's stink bomb detonated.
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Lucky for Sonic, Tails didn't soil his sheets, but the fart was still massive and really wet. Sonic's nose was surrounded on all sides even as he sniffed up all he could. This one had a strong smell of fox droppings along with the rotten egg smell Sonic was now familiar with. That smell and Tails's extremely loud sigh of relief joined forces to take Sonic over the edge. Sonic gave a muffled moan and cupped a gloved hand over his tip to accept shot after shot of hedgehog seed. It was by far the most powerful orgasm of his life as Sonic's hips bucked hard. The satisfying experience felt like it lasted forever when it really lasted under a minute. Not that Sonic cared, he had gotten the relief he'd been looking for all night and as soon as he rode his orgasm out, the hedgehog was rewarded with a peaceful slumber.
The Next Morning
Tails woke up feeling way more refreshed then he did the night before. His tummy had stopped hurting and he could barely remember the nightmare he had. He stood at the foot of the bed to do his morning stretches, but when he bent over to touch his toes his perky butt spoke up.
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"Oops." Tails stood up quickly when he heard the outburst and turned around covering his butt. His face went red when saw Sonic sleeping in his bed, realizing he had farted in the hedgehog's face. 
"Sorry, Sonic." Tails whispered. He wondered what Sonic was doing in his bed but then the fox's tummy reminded Tails of something important he needed to do.
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Tails sprinted to the bathroom to take care of his morning business but as soon as he left the room Sonic opened one eye. The hedgehog had only pretended to be asleep and now that he was alone, Sonic sniffed up Tails's short burst of gas as he massaged his morning wood.