It begins

The little tendrils lowered towards his erect penis as he sat there, waiting and watching, unsure of what they were going to do. He glanced over at the book again, reading the words Prope Ostium so that he would remember them in case he needed to use them until he felt the gooey tendril touch his cock.

"Oh shit," he said as the slimy little tendril began to stroke his member.

He wasn't sure if it was his excitement, Voroth's power, or the slime, but the sensation was incredible as they gently tickled his member. The strokes left a thin layer of slime on his member as he tilted his head back, enjoying the sensations as they just seemed to want to tease him for now.

"Wow, this is incredible," he said as he spread his legs a little, giving Voroth full access to his sex organ, not noticing the tiny portal growing just a little wider, about the size of a penny now.

The tendrils seemed to be teasing, but also examining his cock, feeling every part of it, reacting when Andy let out a moan like it was studying the best course for pleasure. It started to focus on his frenulum for a moment after it learned that it was a sensitive area. Andy was sure it had done this to many different creatures from different dimensions, so of course, there would be a learning period.

Soon one of the tendrils began to focus on his balls, slithering around them and waiting for Andy's reaction as it tickled them. The other one coiled around his shaft and began to gently stroke him while the second one massaged his balls, and Andy loved every second of this.

"Yes.... oh fuck.... this is incredible!" He said as he glanced down, watching them have their way with his penis while a third little tendril began to slide through the portal, which had grown to the size of a half-dollar at this point.

The third tendril started tickling his urethra while the other two continued what they were doing. He bucked his hips a little as he just laid back and enjoyed what was happening, wondering when he would have to close the portal, as it grew just a little bigger.