Warning: this is the first porn fic I wrote, so I hope I didn't mess it up. Hope you'll enjoy it :)
To be honest, he didn't really know how the situation got so wrong so quickly; few seconds earlier, they were looking for clues in the backroom of a seedy night club, trying to be silent and not to get caught by the bouncers.
Few moments later, they got suddenly encircled by five of the biggest man he's ever seen (quite a lot of exercises, definitely tons of steroids).
He was fit and Sherlock knew few useful tricks of some martial arts, but there was no way they can manage to knock those giants down, so he did the only thing he could do: he grabbed Sherlock's hand and took advantage of a single mistake their enemies did to rush out the back door.
They ran recklessly for at least 20 minutes, John always dragging Sherlock, before they found a hidden alleyway and John literally threw Sherlock in it.
That - that - was insane.
Definitely insane.
John didn't actually know how they escaped that hell of a nightmare.
They rested still up against the wall for few seconds, heavily panting and coughing, before something in John's mind broke loose and he found himself pushing Sherlock against the wall and kissing him forcefully.
Their mouths were indecently open, their tongues were dancing one round the other as in the most difficult choreography ever and their moans sounded hungry and desperate in the cold and still winter air.
John spread Sherlock's lapels and nipped the sensitive neck the young detective was gently offering him, then slid his hands down his hips and reached the waistline, before being stopped by a belt.
He stopped for a second, then he unbuckled the belt, zipped sherlock's trousers down and pushed a hand in Sherlock's fly.
An anxious sound escaped the detective's mouth as he pushed his groin forward to meet John's hands, and John couldn't help but grinning and bit again the pale flesh of his neck;
then, he fell to his knees and pulled Sherlock's cock out to meet his lips.
When he felt John's warm breath and wet kiss on the tip of his cock, Sherlock almost lost his balance, though he was resting on a solid wall; John kept on kissing and lightly licking the whole length, moaning and making his tongue vibrate to increase Sherlock's pleasure to a level he never reached before.
When he spotted the first drops of precum on Sherlock's tip, John licked them away with lust and hunger, before taking his whole cock in his hot mouth and starting sucking harder and harder.
Sherlock felt his legs buckling and trembling as he tried hardly to keep at least a decent composure, and John clasped his fingers on Sherlock's buttocks and used them to push his friend's - or lover now? - penis
deeper in his mouth and throat.
The young man started feeling a hot outburst in his belly, telling him he was close - oh, so close - to climax.
"Joh-hon" he mumbled, "I think you probably would prefer to stop it now... I cant' keep it anymore..."
John gave a dry giggle, his mouth still surrounding Sherlock's dick, and he pushed one of his fingers between Sherlock's buttocks with dexterity; few seconds after John reached his little and intimate hole, Sherlock hissed a "Fuck" and came in John's mouth.
John swallowed his semen greedly, savouring his flatmate's - or lover now? - hot and salty essence and enjoying the blissed look on Sherlock's face.
He raised from the ground, standing in front of Sherlock and helping him re-arrange his trousers; he was smiling, not the lusty smile he had before, but a genuine happy smile as he kissed Sherlock on his lips again and Sherlock murmured him "Thank you... now please take me home and take me harder and harder 'till I'll be finally satisfied".
"Oh God, yes!" John exaled.