A/n: Hi guys! Slight warning for male/male action, hinting towards sex. So it's MorMor, my first time writing for this pairing, though it's one I've enjoyed for a while. Set as young Jim and Sebbie, I'm thinking Sebbie's probably about 20-21 y.o. in this. Reviews are always welcome!

"They're shipping you out." The four words that flowed from the Irishman's mouth weren't forming a question. He could read it from Sebastian's face, his stance and the folded cream-toned paper in his hand. "Don't go." The teenager's voice held a plaintive note as he gazed up at his military lover. The request was no use and Jim knew it, but he tried anyway.

Sebastian grasped Jim's hands, holding them close to his chest and the cool dogtags hanging from his neck. "I have to," he murmured softly, closing his eyes. "They're orders, Jim."

Jim pouted up at Sebastian, glaring beneath his eyebrows as his hands balled into fists. "What if I ordered you to stay?" That drew a morose chuckle from Sebastian's lips.

"It's not the same."

"Then... how long do you have?" Jim's voice was cracking slightly now, and tears pricked his eyes. He wasn't going to cry. He refused even letting himself experience that embarrassment, let alone allowing anyone to see it.

"They want me on base in the morning." Sebastian's reply took a while in coming. "I only have tonight here." Jim looked away at that. One night. That was all they had. Jim might never see Seb again. This could be their last time together ever.

"Seb," Jim whispered, "don't leave. I don't want to lose you."

"You won't, sweetcheeks," Sebastian muttered against Jim's cheek, having pressed a kiss to the soft skin of his lover's face. He pressed another kiss closer to Jim's mouth, trailing gentle kisses until their lips met. The touch was soft but both of them could feel the heat brimming behind it. Sebastian was pushed into the wall behind him, Jim's fists breaking from the soldier's grip to reach up around his shoulders. Shoulders that would know the weight of a gun... but Jim refused to think about that, relieved when Sebastian pulled him closer, eliminating nearly all thoughts. All that remained was the processing of each touch, each breathy sound, that the soldier made.

Jim's control over the older man didn't last much longer; Sebastian, trying to keep their proximity, kept an arm around Jim's waist as he guided him back towards the bedroom door.

It was still dark when Sebastian woke up, wrapped in sheets and Irishman. Groping for a phone on the nightstand, he found it was still a couple of hours before he had to leave. He looked down slightly, seeing the silhouette of his lover, admiring the soft features in the silver of the moonlight. Jim was only a couple of years younger than him, but Sebastian had never met anyone as smart. Sebastian wasn't stupid, but Jim's brain was intimidating. The young criminal was warm though, and positively adorable in the calming grip of sleep. Memories of a few hours before filled Sebastian's mind, bringing a smirk to his face. The smirk grew at the memory of Jim's lips on his cock, reminding him of the hot skill the Irishman had. A second recollection, the trembling tanned back beneath him as pounded inside over and over, drawing closer to a climax stronger than he thought possible after cumming not long before, left Sebastian's breath as a jagged exhale. He was drawn from his thoughts as Jim shifted in his sleep, rubbing his cheek against the soldier's chest. This made Jim's short hair tickle Sebastian's nose, flooding it with the smell of pina coladas, hints of coconut underneath the scent of pineapple.

Jim Moriarty, he thought, was Mister Sex.