The Doctor stared at the Doctor…Yes you read that right, the Doctor, fourth, as usual, is staring at one of his future incarnations. The 20th, in fact. The fourth Doctor, who we well just call "The Doctor" was unable to ignore his rising arousal. Twenty was bloody handsome as shit! He was only a couple of years younger (both physically and in current body appearance than the Doctor) with short, straight brown hair and green eyes. His accent was British like the Doctor's. Not to mention (because they were both naked) he had an impressive penis…but then, so did the Doctor. He could see his own genitals were exciting Twenty, as much as Twenty's were exciting him.

"Man, you are a sight to behold…!" Twenty gasped, "You're so fucking sexy, I feel like a could release without being touched!"

The Doctor growled the way he usually did when overcome with sexual arousal. "Don't you dare…!" he he grabbed Twenty's arm, "I must be the one to make you cum!"

"Likewise…" Twenty grinned.

The Doctor kissed him. "Shall we let our cocks get to know each other?" he asked, lustfully.

"Mmmm…" Twenty groaned, "Yes…yes that sounds great, Doctor…"

The Doctor shoved Twenty onto his back and straddled him. He began to rub his penis against Twenty's. Both men moaned as pleasure waved through them.

"Tell me a hot story…" Twenty demanded.

"I once…had to fuck a Cyberman…" the Doctor gasped, his eyes rolling with pleasure.

"Go on…"

"I…I…shoved my cock up its arse and fucked it until it short-circuited. I came inside it and my cum killed it!"

Twenty laughed, "Awesome…now I'm gonna cum inside you!"

Twenty applied some lubrication.

They flipped positions. The Doctor wrapped his legs over Twenty's back, giving the younger Doctor easy access to his arsehole. Immense pleasure coursed through him as he felt Twenty's penis slide inside him with the help of the lubricant. As Twenty thrusted inside him, the Doctor gasped and, on a few occasions, giggled. After a few minutes, the Doctor felt Twenty ejaculate inside him. Twenty engaged in sexual activities far more frequently than the Doctor did. Therefore, he did not have much built up to release. The pleasure was good enough though.

"Be warned…" The Doctor said as Twenty positioned himself as the Doctor had just been, "I don't wank often and I don't fuck as often as people say I should, so my balls are filled with cum that hasn't been released."

Twenty sighed. "I want every drop of that cum inside me…" he moaned.

"I also take ages to cum…"

"Good, the buttsex will last longer."

The Doctor felt pleasure course through his body once more as he slid his penis into Twenty's arsehole.

"Oh fuck…!" Twenty gasped as the Doctor began to thrust, "Doctor…Fuck me like a beast!" the Doctor couldn't help feeling satisfied as his penis stimulated the younger Doctor so much, that the latter began to masturbate.

Moaning and panting the Doctor bent his head towards Twenty's penis.

Twenty understood and moved his hand away. The Doctor took Twenty's penis into his mouth and, using the movements of his thrusting began to suck him off.

"Yes…" Twenty gasped, "Oh, Doctor…!"

This went on a for a minute or so.

The Doctor moaned onto Twenty's erection. With a small whimper, Twenty ejaculated and the Doctor swallowed. "Who knew my Twentieth self would have such good-tasting seed…" he gasped.

Twenty grinned. "Glad you like it…" he replied.

Soon the Doctor began to feel that close-to-climax feeling. "Twenty…" he breathed, "I'm beginning to get close to cumming…"

Twenty sighed, "I'm ready…"

The Doctor rested his head on Twenty's stomach (easy to do because he was tall) and Twenty's hands caressed his curly brown hair. The tingling became intense. "Oh, great Ursa Major…!" he moaned, "I'm going to cum…!" the Doctor's cry was loud as he ejaculated, his hips trembling and his penis jolting as it released every drop of his semen into Twenty. This prompted Twenty to ejaculate for a third time and they both collapsed, gasping, their total of four hearts pounding.

"Thanks, Doctor…" Twenty gasped.

The Doctor was too out of breath to reply. He just smiled and patted the Younger Doctor.

The End.