"So that went better than expected," Tony said, watching Loki.

His boyfriend looked like a million-ton boulder had been lifted off his shoulders. He'd never seen Loki smile so much and so easily. It looked good on him. Really good.

Loki closed the door and let out a long sigh. "Yes, it went better than I could have guessed."

"They love you Lokes, they're just glad you're alive," Tony said.

"You might not live much longer if you keep calling me Lokes," Loki said, crossing his arm with a smirk.

Tony laughed, "Come on, let's help dum-e get the plates picked up."

"Yes, or else we may not have any plates left," Loki said.

They beat dum-e to the table and got everything into the sink where Jarvis took over the clean up. Tony sighed, "Feels weird eating stuff again."

"Are you sure the food consumption option is working? Last time you got ill."

Tony groaned at that memory. "Yeah I think it got worked out in this model."

Loki nodded, and sighed. "I can't believe this went well."

"I can't believe your brother actually eats that much," Tony said.

Loki shrugged, "He always has."

"I'm going to go finish some of my work before bed. Can you keep yourself out of trouble?" Loki asked.

Tony grinned, "Oh, always."

Loki smiled and kissed his cheek before he went to work on the patio. Tony savored the feeling of Loki's lips on his cheek. Soft and warmth filling an ache that spanned years. He watched Loki for a moment before heading down to his own lab. "How's that latest Mach going Jarvis?" he asked.

"Just finishing now sir."

"You're the best," Tony said as he got the android body he was wearing to its proper platform and then slipped out of it. "It's been fun 18, but I got a higher class ride."

"You used the new silicone base model with implanted neural detectors?" Tony asked.

"Of course sir."

Tony grinned and floated around the lab, "Well don't keep me in suspense, let's see it!"

There was a faint hiss as the chambers they'd converted to the android creation center or 'baby maker' as Tony had labeled it opened. Tony floated over and whistled, "I'm one hot piece of ass, huh?" He nodded.

This model looked more human, in fact, aside from the slumped over lifeless posture, Tony would have though it was some kind of person sitting there, albeit a person with his face and looks. Tony grinned, "It's ready for a driver, right?" Tony asked.

"Yes sir."

"All biological functions intact?" Tony asked as he circled the android. It looked perfect, even down to that freckle on his ass.

"Sir, this is the 25th iteration. I have included all requested elements including biological functions."

"Just checking ya Jarvis," Tony said as he slid into the android.

This time it felt natural, not like he was wearing an ill-fitting glove all over his body, but that he just was. He took a breath and felt the crisp air of the 'baby maker' burning against his lungs. "Damn. This is... amazing," Tony said.

He took another breath then pinched his arm. It stung and he laughed. "Holy shit! Loki!" He ran up the stairs and for Loki.

The patio was empty and Loki could hear footsteps overhead in the bedroom. He grinned and ran up the stairs, "Loki!" he yelled as he burst into the room.

Loki sat in bed with a book and looked up then stared, "You are naked."

Tony looked down at himself, "Yeah, I look good, uh?" He grinned

"What are you doing?" Loki asked.

"This is my newest model and I feel like a person," Tony said then laughed.

"Congratulations," Loki smiled, "Now, pants?"

Tony grinned, "Why on earth would I do that?"

Loki laughed, "You just showing off?"

Tony crawled into the bed, "Come on, we've been together a year almost and while talking through jerking off is the hottest thing, the one thing I really want right now is to get a real taste of you," he purred.

A faint flush crawled up Loki's cheeks and Tony loved the color, candy apple red and Tony wanted a bite. He crawled across the bed and pulled Loki's book aside to pull his boyfriend into a kiss. The flavor of Loki's lips burst across his tongue, sharp and more vibrant than any meal. Loki groaned and just pulled Tony tight.

Tony smiled. It'd been a while but he still knew what to do as Loki slid onto his back and Tony straddled him, keeping their lips together. Loki pressed up towards him, holding Tony closer and stringing his fingers through Tony's hair before Loki pulled back and caught his breath. "You must like this one. You haven't done anything like this in the other mock ups," Loki said.

Tony smiled, "Yeah, this one feels like Tony Stark in the flesh and you taste even better than I've been imaging," he said before licking his lips.

Loki laughed breathlessly before pulling Tony back down into a kiss as Loki began unbuttoning his shirt and peeling it off.

"I'm guessing sex isn't too different in the future here," Tony said as he parted their lips to let Loki more easily remove his shirt.

Loki smiled, "No, I doubt that has changed since man first discovered it."

"Thank god, why mess with something already awesome?" Tony asked with a grin.

Tony's fingers toyed with the button of Loki's pants. Loki took a breath, arching his thin hips towards the touch before he let out a long breath and nodded. "Yeah."

Tony smiled and unbuttoned his trousers before slowly lowering them down.

"You still remember how it works old man?" Loki asked breathlessly.

"You wound me," tony grinned.

Loki lifted his hips and tony gently began tugging Loki's pants down his thin hips. Even through his boxer briefs tony could see Loki was half-erect already and tenting his underwear. He grinned, "Do you remember how to do this there hermit?" Tony asked.

"I have had sex more recently than you," Loki huffed.

"That's not a great record babe," tony said.

Loki leaned in to kiss him and tony moaned into his mouth as their bodies pressed together and tony suddenly realized he was hard, already totally hard and feeling like a teenager who had just discovered jerking off. At this rate he wasn't going to last long at all. He just hoped he had the recovery rate of a teenager too, he sure as hell was not going to be a one and done tonight. Not when he finally had his hands on the long, lean body he'd been fantasizing about since the moment they met basically. Not that he would admit that to Loki. Hologram in an android body Tony Stark might be but he still had his pride.

"You look like you're happy to see me," Tony said.

"I am very happy to be touching you."

Tony let out a long breath, "Likewise hot stuff."

Loki pulled tony into another kiss and arched his hips to grind into tony with hunger. Tony moaned and pressed back against him. His skin felt like it might burn him up and he was fanning the flames. He'd happily let himself be consumed by this heat. "Fuck, Loki."

Loki smiled, "That is the idea yes."

Tony groaned and pressed his face into Loki's chest. Loki strung his fingers through Tony's hair. "The great Tony Stark shy?" He asked.

"No. Just… I'm already about to shoot off a firework show and you're not even naked yet. That's a little embarrassing," Tony muttered.

Loki laughed and pulled his face up to kiss him, "Shoot off as much as you want. We have all the time in the world now." Loki said.

Tony grinned, "Yeah well I'd like to start tonight off with some banging rather than waiting for the rest of the time in the world. I've waited long enough. We both have."

Loki kissed him again, moving their bodies together slower, rubbing and pressing together like they could somehow find more space there to let them fall closer together.

Loki finally pulled away enough, forcing a distance between them so he could get his last article of clothing off. His underwear soared off the bed and tony moaned at skin touching skin with nothing between them anymore. Loki's body was flush and firm, pulsating against him. Tony swore he could feel the hum of the nanobots thrumming against Loki's skin likes drumming in his veins. Their lips crashed back together and this time they writhed together without a rhythm or a pattern other than a desperate need to feel good, to feel together.

Tony came fast and hard and with only a soft cry as a warning before slickness spread between them. There was silence then Loki laughed. "You built a body that could ejaculate?"

"I built an anatomically articulated body!" Tony protested as he tried to catch his breath.

"What on earth even is that liquid?" Loki asked, reaching between them to run his fingers through Tony's mess.

Tony grinned at him, "Lube."

Loki blinked then laughed so hard he shook the whole bed. "You pervert!"

Tony just smiled, "Genius right?"

"Clever and also somewhat disgusting," Loki said.

Tony gave him a quick kiss, "But mostly clever."

"I did not say that."

Tony pouted until Loki kissed him again. Loki's erection rubbed against Tony's stomach and through the lube there. The feeling of Loki writhing against him Sent Tony's own body responding rising quickly again to the challenges.

"You sure about this?" Tony asked.

Loki nodded, spreading his legs and arching his hips, "Yes tony. Yes!"

Tony swallowed hard and nodded. God, he wanted Loki like nothing else, like no one else he had ever known before. He pulled up to kiss Loki again, savor in his warmth and the taste of Loki against his skin. His whole body vibrated around the force of Loki that had entered his atmosphere and now Tony was powerless to break free, and he didn't want to, he'd never met anyone who'd kept up with him, challenged him on every possible level and tony couldn't ever imagine finding someone like that again. It'd taken him more than one lifetime to find Loki and he wouldn't let him go again, not for anything in the entire universe.

Loki kissed Tony again, pulling Tony out of his thoughts and back into the moment in front of him. Tony moaned and brushed his fingers through Loki's hair, tangling in the dark locks and pressing Loki into the bed as Tony trailed his fingers through the slickness he'd spilled. He lubed up his fingers and glanced at Loki.

Loki offered a smile and another arch of his hips. Tony stole one last kiss before his fingers slid slowly between Loki's legs, tracing over the soft flesh there before finding Loki's entrance. He traced a slow circle before slowly starting to push in with just one finger. Loki shivered under him, dropping his head onto the pillows with a groan.

Tony moved slowly, deliberately. He wanted this so bad he was shaking but he'd be damned if he was going to rush this and make this experience anything but perfect. He wasn't going to hurt Loki no matter how much he wanted to feel this tightness all around him. Loki shuddered again and Tony felt him relax just marginally.

Tony took that chance to slide in another finger and beginning to slowly scissor and stretch Loki open. Loki's thin fingers gripped into the sheets as his breath caught in his chest and came out in short, sharp puffs.

"You ok?" Tony asked.

Loki managed a nod but no words.

Tony focused on Loki's face, on the way blood rushed up his cheeks, how he bit his lip to try to keep himself quiet. Loki's hips rolled into the touches, urging Tony on and Tony finally pushed in a third finger. A moment of resistance faded into tight, warm welcoming bliss and Tony moaned, imaging what it would be like to feel that tightness all around him.

Loki whimpered in soft, pleading mewls as he clawed at the sheets, "Fuck, Tony...get...get on with it!"

"You sure you're ready?" Tony asked, pressing a bit deeper and Loki bucked up into the touch. Tony grinned, "Yea?"

"Dammit Tony, just... just do it!" Loki begged.

Tony pulled his fingers freed and slowly positioned himself. His hands traced along Loki's thighs before he began the slow push in. He and Loki moaned together as tightness wrapped around Tony. He had to stop and catch his breath before he continued pressing slowly in until he finally pressed flush against Loki. They both panted for air and Loki quivered around Tony.

Tony couldn't quite form words as he tried to keep himself under control. He was not going off again, not without Loki at least getting his own orgasm first, but he didn't know how long he'd last. He had to make it happen though so he bit at the inside of his cheek. Pain still felt foreign against his mind but it stilled the boiling orgasm just beneath the surface as he caught his breath and got himself under control.

Under him, Loki shifted and adjusted his hips. "Move," Loki said.

Tony didn't need to be told twice as he began moving his hips slowly at first, learning Loki's body. Then Tony began to shift his hips, arching and twisting until Loki gave a sharp cry, his toes and fingers curling as his eyes flew wide open.

Tony grinned; oh yeah, he still had it. He bit harder at the inside of his mouth as he moved faster. Loki's voice climbed higher and louder with each thrust, his fingers freed themselves from the sheets and scratched down Tony's chest instead. The welts of pain boiled in with the hot pleasure of sex, burning pain and pleasure into a hot sensation that filled every bit of Tony's body. Every sensation was filled with pleasure and he knew the end was coming fast.

He reached down to begin stroking Loki's erection, it already leaked with pre-cum and the touch sent Loki arching into Tony's touches then rolling into Tony's pounding pace. His voice screeched and his nails bit through skin as Loki's body quaked then tightened like a vice around Tony as he spilled into Tony's hand and quaked all around Tony's body.

Tony only made it another second and another thrust before he came with a strangled shout. Then he dropped onto Loki where they both panted for air in a silence filled only with hot puffs of air.

"How'd I do for an old guy?" Tony finally asked.

Loki laughed and kissed Tony's cheek, "Maybe next time we can last a little longer, but I am not complaining."

Tony grinned and gave Loki a kiss, "That was incredible. You're gorgeous you know?"

Loki smiled, "I have heard that."

Loki stretched and once Tony had caught his breath, he slowly pulled free. Loki whimpered a bit and sagged down into the bed.

Tony kissed his forehead and climbed out of the bed, "Let me clean you up."

Loki nodded, "Please."

Tony walked into the bathroom and washed himself off quickly before grabbing some clean towels and a washcloth and walked back over to Loki to begin cleaning his lower, a smile stayed plastered to his lips.

"What?" Loki asked.

"I just got laid and it was awesome," Tony said.

Loki laughed and shook his head, "You are ridiculous."

"I'm happy," Tony said, tossing the dirty towels and rags to the side and tugging Loki over onto the dry side of the massive bed. Loki smiled and got comfortable against Tony's chest.

"Better than just watching?" Loki asked.

"Babe, as hot as you are, nothing compares to actually getting some real hands on experience," he said.

Loki laughed, "Fair enough."

"And how was I?" Tony asked.

"Oh, you do not need anything added to your ego."

"So good?"

Loki rolled over and gave Tony a long kiss, "Good, and now I am ready to sleep."

"Wore you out?"

Loki rolled his eyes and got readjusted and comfortable against Tony's chest as he yawned. Tony smiled, watching as Loki's eyes drifted closed, his chest evened out as his breathing slowed and sleep washed over him. Tony sighed and ran his fingers through Loki's hair.

He finally had a second chance at living and this time, he wasn't going to waste a second of it this time.

Happy New Year and thank you all for sticking with me!

This marks the end of String Theory. It's been a fun adventure and you all have been amazing the whole ride! 3