"Sherlock," John whimpered, Sherlock's thrusts becoming more rhythmic, "please." Sherlock, while trying to keep the pace, slowly slid a hand down from John's hips to his thighs. Teasingly, Sherlock rubbed John's thighs, getting closer to his throbbing member each time he went up. John whimpered and Sherlock finally grabbed John's cock from the base and slid his hand agonizingly slow down the length to the tip. John bucked into Sherlock's grip, desperate for friction. Sherlock let go and quickly scraped his nails across John's leg. "Patience," he whispered, leaning close to John's ear, "it's not your turn." John groaned beneath him. "Shh," Sherlock whispered, sliding his hand back to John. A few more thrusts and Sherlock became less rhythmic but harder. "J-John-" Sherlock stuttered, "I'm so cl-close..."
"Touch me, Sherlock!" Sherlock grabbed John's dick again from the base and gave it a couple strokes, both men groaning in unison. "John!"
"Oh god, Sherlock, come for me!"
Sherlock thrust again, digging his nails into John, groaning as he came hot in John. Sherlock pulled out, panting. He moved to lay flat on the bed, letting the orgasm last as long as it could. John collapsed onto the bed, eyes closed. The detective turned his head to look at him, then lifted a hand to play with his partner's hair. "John," Sherlock mumbled, moving closer to John, kissing him lightly. John responded immediately, cupping Sherlock's face with his hand he pulled the taller man closer. Happy to oblige, Sherlock moved to John, and straddled him, trying not to break the kiss as it got more heated. Sherlock sucked on John's bottom lip, eliciting a needy moan. They explored each others lips and mouths, sharing breath and heat. Sherlock ran his hands down John's chest and up again to cup John's face. The younger man traveled down his partners body, licking and kissing his warm skin, eventually nipping and biting. "Ow, Sherlock-" John warned but he was far to fast. Sherlock was now gnawing on his flesh, ripping and sucking away blood and gore.
I don't think John realized Sherlock was a zombie.
Oh well.