"Hnngh... Nnnnnnnggggghhh-!"

The station was deserted in the post-midnight hours. The only sound echoed from the men's toilets. 

"Grr...! HRRRRNNNNGGGHH-!"

All the stall doors were open, except one. Through the gap below the door could be seen a pair of grey feet, around which a pair of smart trousers and briefs were piled. Within, the panting elephant was sitting on the too-small toilet, catching his breath for the third push on his knotted bowels.

"Is that a citizen in distress I hear?!" 

The heroic cry came just before a clawed foot kicked the door open. The elephant cowered back as a spandex-clad bird with an absurd red comb and eye-mask stood staring down at him. A big CC was printed in bold letters on the red spandex. At the crotch it was open, exposing a ridiculously erect dick.

"Ah... I see..." The bird strode closer. "You struggle alone against the dread villain known as CONSTIPATION! Have no fear, for CAPTAIN COCK will relieve you of this burden!"

With strength beyond the normal, the bird picked up the elephant and flipped him over, until he was gripping the toilet seat in his hands and his butt was pointed up towards the bird. Firm wing-hands grasped the thick grey cheeks and spread them apart. 

"For no packed-up posterior can withstand the might of my PRE-LUBED PELVIC POUNDING!"

"AAAAAAH-!" The elephant shouted as the bird's cock thrust roughly into his ass. His tightly-clamped hole was thrusts wide around the invading tip as it buried into him, grinding against the impacted mess that formed the plug at the exit of his bowels.

"Ho! You are quite severely bunged-up, citizen! It is lucky that I came when I did!" 

The bird pushed his hips forward. The elephant whined and followed the motion. The bird's dick was pushing against the poop that had piled up in his bowels, pushing it back up! The pressure was unbelievable!

"It is firm and unyielding, but will it still be after I deploy my BUSSY BREAKER?!"

The elephant found himself lifted impossibly into a full-nelson pose, his legs held apart, his own body weight pulling him down onto the bird's cock. The bird pounded back, his hips slapping against the elephant's cheeks, sending a constant [b]THWAP THWAP THWAP[/b] echoing through the night-time background. 

"Ha ha! It is breaking apart!" The bird crowed triumphantly, as brown poop-pellets leaked out where he was fucking the elephant's ass. "Not long now!"

The elephant just whimpered, the friction of the bird's thrusts resonating all through the packed poop in his bowels. To his humiliation, rough sex with this costumed freak had started his dick firming as it bounced. He was getting horny, despite the desperation. 

"One more blow will break the bowel barrier for good!" The bird thrust himself deeper and deeper, hilting himself inside the broad grey rear. "Take this COLON-CLEANSING CLIMAX!"

The bird cawed happily as he erupted hard into the elephant's butt. The elephant groaned as his belly swelled, the cum flooding around the poop and filling those few unfilled places, stretching his bowels to the limit. 

The bird panted and set the elephant down, letting him grip the toilet to brace himself. 

The elephant huffed and panted, bent forward while his tail raised and his tailhole flexed. His knees bent and his stomach growled. 

"HNNNNGH-!"

His asshole spread wide, erupting with mix of firm poop and cum. The big blockage splattered hard on the floor followed by a deluge of sloppy white cream.  The elephant groaned as his bowels, finally unplugged, started squeezing and pushing out everything that had been built up.

As thick, sloppy logs spilled out and pooled behind him, his dick twitched. Everything ground against his prostate on the way out, finally pushing him over the edge. He let out a heavy orgasm, spraying his cum against the base of the toilet while his mud-mountain built up behind him. 

"No further bowel problems here, citizen!" The bird nodded proudly, hands on his hips, dick dripping with brown juices. "I shall leave you to your relief, for other citizens may need my help! Captain Cock AWAY!"

He dashed away, out of the bathroom, leaving the elephant grunting, gasping, and shitting behind him.