"Woah woah what are these things? Whats it doing?"
"They um... Oh... we call them...oh YES! call them Orgoblins!" She said trying to speak through the pleasure she was experiencing.
"Whats it doing?" He said as it started to hover above his cock. Before he could do anything else the creature flowed in to the tip of his cock filling up inside his member. Mark moaned out loudly as the creature took over his penis.
"What the... holy shit!... what is it...WHAAATS it doing to me?"
Rose was biting her lip and moaning, she composed herself the best she could and said "Orgoblins bond with... with sexual organs and feed off of orgasms."
"Wait? My cock is POSSESSED?"
"Yup... don't woooorry, once its had its fun it will...oh shit!... leave."
Before Mark could say anything more his cock started pulsing. He could feel something moving around inside it and as strange as the sensation was it felt really good. His cock was twitching and pulsing while his balls felt like there being massaged from the inside. He could see his ball sack moving like something was inside it playing with his balls.
Rose yelled out as she came squirting green goo out of her pussy all over his chair and floor but he was too distracted to worry about the mess. She started moaning again as it seemed the creature wasn't done with her yet. His cock pulsed harder and harder to the point where he could hear a squishing sound every time it move. He was afraid to touch it feeling like it could explode at any time.
"Holy fuck!...HOLY FUCK!!" He said as his cock felt amazing and he knew he had no control over what was happening to him.
His first orgasm hit him like a hurricane. He had never cum so hard in his entire life as he squirted green goo so far up it hit the ceiling before it started dripping back down on top of him. He wasn't even sure if the green was from what Rose had done to him or the creature occupying his cock but he didn't care. He cock was still pulsing and felt amazing. Whatever this creature was it had complete control over his organ and every nerve ending inside it. He hear Rose orgasm a few more times but soon all he could focus on was his own. Every few minutes his cock would erupt soaking everything in a green sticky slime that was now all over the room from his and her orgasms.
What seemed like hours had gone by as they both enjoyed the continuing pleasure they both received. Soon he felt one more orgasm building. It was more intense than all the other he had experienced with this thing inside him. He watched as his cock seemed to swell like it was about to explode keeping him right on the edge of release until he finally erupted again but this time green smoke came poring out of his cock. He could feel the creature flowing through his entire member as it exited his cock tickling every cell on its way out to the point that after it was out of him more green fluid came poring out behind him.
Mark laid in his bed covered in green goo trying to catch his breath as his cock was now free from possession. Rose's had finished with her as well and she was still sitting in his computer chair with a very satisfied look on her face. It wasn't long before Marks eyes closed and he fell asleep from exhaustion.
The next morning he awoke ready to clean up the mess made from the night before only to find his room was already clean. He had no goo on him, his sheets were clean, it was like it never happened. He looked over and on his nightstand he saw a glass jar fill with green smoke. There was a note on the top that said "Left a little present for you! Im taking the night off but just in case you get bored!" Signed Rose.