We were on our third day of me having my way with Mark. So far, I had fucked his ass nine times, cumming inside him seven times, shooting my wad on his ass twice more. He had sucked my cock five times, swallowing the load each time and he had been allowed to cum five times.
It was now three in the morning, I had gotten up to go take a leak and came back into my dorm room, and saw his perfect ass spread wide open, his legs still tied spread eagle on the bed. His hands were still tied to, exposing him completely. I reached down and gently rubbed his beautiful ass, he moaned and asked, "Are you going to fuck me again?"
I grinned to myself and asked, "Do you want me to?" Slipping my fingers between the globes of his ass, my middle finger teasing his hole.
"Either that, or," he hesitated, "or, fuck my mouth again."
I smiled and said, "I've got an idea." I then reached over to my desk and opened the drawer, pulled out a seven inch dildo. The dildo was about two inches round and curved just like a real dick. I grabbed the lube and slicked the dildo up, then I applied some lube to Mark's ass crack and pried his hole open just enough to squirt the lube into his butthole.
I slowly worked the dildo deep into his ass, inch by inch it disappeared into his butt.
"OH! OH! That's fuckin' awesome!" he groaned. "It's huge! I love it!"
Soon, the full seven inches was in and I began to pull it out and shove it back in. First only an inch or so, then two, then three. Now I was pulling it a full six inches out and ramming it back inside his ass, with each thrust he screamed into the pillow under his face.
I now had the dildo buried completely in his butt. I grabbed the duct tape off the table and tore off a six inch strip. I then taped the dildo in place, using his round butt to anchor the tape down.