Zoro got up and grabbed a towel to wipe the sweat off of his face. He just finished working out and was going to take a nap, when he suddenly noticed a box with christmas wrapping and a bow tied around it at the exit of the gym. He walked up to the box and picked it up. On top of it there was a tag that said "To: Zoro From: Robin". Zoro opened the box, revealing a big and plump pair of ass cheeks, glistening from being oiled. A note was also found in the box that said "I hear you like this kind of thing, fufufu~."
"Heh, how'd you know? Let's see how you stack up to Perona." Zoro said with his signature smug grin.
He groped the ass cheeks with his free hand, they were soft and squishy, his hand practically sank into them. When he gave them a slap they would jiggle and ripple for a few seconds. He spread the cheeks and noticed the butthole. It clearly has had a lot of use, it was more of a slit that a hole and it beckoned to him immensely. He took a finger and dug into the ass and it welcomed it with ease. It was warm inside and Zoro prodded around, pressing the walls with his finger. He did this for a few seconds before entering another finger, continuing this with each finger until his entire hand was inside her. He pushed his hand as deep as it would go and it went all the way to his elbow. Zoro pulled his arm out in one swift motion, and the asshole stayed gaped.
Zoro then pulled his workout shorts down and pulled his cock out, already hard from playing with the ass. He went to a table and placed the ass on a table and angled his cock to the hole's entrance which had finally closed again and shoved it in. His cocked was as wide as his forearm and almost as long, making the ass stretch back to wide open. Whenever he thrusted into the ass, a loud "PLAP" would echo through the gym, and the cheeks would jiggle and ripple like gelatin. As he was fucking the asshole he slapped each cheek with his hands, causing the asshole to tighten on him even more. Zoro fucked the ass for what seemed like an eternity to Robin. She didn't think someone could have such endurance, and she was going delirious from the giant cock reaching the deepest depths of her ass for so long. Her masturbation became stronger and faster until she came, her ass tightening up as much as it can around Zoro's cock, which didn't stop him at all from continuing his thrusting. The fucking still went on, and Robin didn't know how many more orgasms she could take before passing out, but thankfully she could finally feel Zoro about to orgasm. He thrusted in as deep as he could go and unleashed his hot load deep into her bowels. He came an unbelievable amount and she felt like her stomach was expanding from it all. When he pulled his cock out large globs came spilling out of her gaped hole, unable to close it from weak muscles. Robin gave a sigh of relief, but was also a little sad at its ending.
"Phew, thanks for the post-workout." Zoro said, as he gave it another slap, causing Robin to gasp and cum one more time.