Meanwhile at Bowser's castle...

Bowser dropped Luigi off at a large steel door, smiling like a clown. As he opened them, Bowser looked directly into Luigi's eyes and sniffed up his boogers.

"Behold Luigi... my SEX SLAVE DUNGEON!" Bowser announced proudly.

Dozens of Italian men were chained up in the dark of the room, their only sustenance being their own feces. They each had a strange device tied tightly around their cocks, it beeped and booped and sometimes even zeeped.

"I put a spell on them Luigi. They can only cum when I snap my toes," Bowser finished speaking and pushed Luigi inside the dungeon, then closed the large door.

Mario was going through the hills, the deserts, mountains, and many more biomes at record speeds. His last challenge however was right next to Bowser's castle. The Forest. He started to wade through the large swampy mud puddles and wiggly worms. The truth about wiggler worms is that each segment of their long bodies is a testicle. So, when Mario jumped onto the back of a wiggler worm, it would screech in pain and cum all over.

Back at the sex dungeon, Luigi was frozen in fear. He had been chained up, fully naked by something slimy in the dark. Bowser was licking in between his toes, finding bits of dirt and some kind of cheesy substance.

"That reminds me..." he whispered, as he smiled an evil smile.

He licked all over Luigi's cock and found the smegma hidden within. He swallowed it all and vomited it inside Luigi's tight asshole. He took all of it out, spoonful by spoonful, and fed it to the poor Italian. When he finished, he opened up the stinky asshole and shoved his spiky head inside while fingering Luigi's urethra.

His long nails cut the inside of Luigi's dick. Luigi could feel Bowser's enormous reptilian meat-scepter touch his buttcheeks. Bowser's hot breath blew up his neck like steam from a pot, and the koopa's dick inched into Luigi's now stretched hole.

A koopa opened the door instantly, "Uh- sir, sorry to interrupt, but Mario is only 1.5 kilometers away. He should arrive from the forest within the day," he barked.

Bowser grunted angrily, "Double the guards, fortify the towers, prepare an army to meet him. Whatever happens, do not let him get through those walls."

He turned back to Luigi, kissing the air before throwing a used condom in the man's face and left. Bowser walked to another room, clicking a red button and then pushing 420 buttons on a keyboard in five seconds. The wall retracted to reveal another small room. One wall was made of thick glass, and behind it was an enormous warehouse-like space.
Bowser leaned in to look through the glass better, the blue light from the room dimly illuminating his face, and he reached out to touch the glass. He pressed his palm onto it, and a huge reptilian- humanoid hand smacked the glass in an attempt to grab him.

"They are perfect..." Bowser said quietly in awe.