This chapter is M for a reason. As in... M. Capital. Period. Just making sure you know what you're getting into ;)
Later, when Loki started to hang out with Tony just to be by his side after the accident, the understanding between them was a silent acknowledgement that it wasn't about the sex any more. It was the sense of understanding that they each gave the other, the way the silence dragged on and on, yet was still comfortable as Tony worked in his lab and Loki just watched or entertained himself for hours on end, content to be in his company.
At one point Tony realized what had happened, after he had shocked himself when he refused an invitation from a girl at a bar that he normally would've taken to bed without hesitating.
"What is this... thing we have?" He ventured out one afternoon while he was working in the lab, with Loki sitting on a bench reading. The god looked up.
"Hm? What thing?" His voice was puzzled.
"This. You and me, the sex, and now it's like this, and I don't know how to define it." Tony blabbered, waving his finger between the two of them.
"Does it need definition?" Loki asked quietly.
"I need it to have definition. I don't know what's going on. What do I tell the person who asks me to bring them home from the bar?" Tony ranted, missing the way Loki's mouth tightened upon hearing his words.
"I don't know, what did you tell them?" Loki questioned smoothly, a coldness entering his voice. Tony glanced at him and stopped his pacing.
"I... I told them I couldn't." Tony faltered, ears tinged red. Alarms were going off in his head, some about how he shouldn't have opened his mouth, and most of them to please not anger the Norse god of mischief. The latter was from a voice that sounded just like Pepper.
"Why'd you do that?" Tony could tell the trickster was enjoying this far too much, but didn't want to say something that would get him in trouble. There were far too many holes to fall into with this conversation, and he didn't like it.
"Because... I don't know why! It's why I'm asking you, so if someone asks I can either tell them I'm in a relationship, or to come on over, because I hadn't scheduled a fuck with the god of mischief that night!"
Tony gulped at the expression that entered Loki's eyes. The god swung his legs off the bench and sauntered over to the suddenly silent man eyeing him nervously, Loki's face shadowed and coldly regal.
"Is this a relationship, Tony? I won't ask for it to become one. But what you say now changes what happens after this."
Tony felt a cold sweat break out all over. He couldn't leave. The god wouldn't just leave, would he? Except he would. What was holding him here anyways?
"Would our 'relationship' be exclusive?" He blurted out.
Loki smirked at him. "Only if you keep me satisfied," He purred. "I do not wander if I am committed, Tony." He said as an afterthought, quieter and dead serious.
Tony picked up the gods hand, staring at it as if his life depended on it. "I aim to please," he said quietly.
"Then if you want, you can tell the next person who wants to take you home that you are in an exclusive relationship. Or chance me ripping their guts out and strangling them with their own body parts." Loki said the last part with a remarkably clear face. Tony's head whipped up and he stared at him, before seeing the glint of mischief in his eyes.
"Ha! Don't joke like that." He said, heart beating just slightly faster for the possessiveness he heard in the gods voice.
"I do not joke, Tony. You would do well to remember this if you truly want to call this a relationship." Loki purred with a dark underlying tone, stepping closer and closer until he was flush with Tony's body. Tony's breathing hitched.
"I... I..." This was stepping on thin ice... He moaned, losing his train of thought. Shit, he was supposed to say something, wasn't he? Loki's hands were wandering up and down his body, squeezing and kneading and pinching- "Fuck, Loki, can't concentrate!" He gasped.
"What will it be Tony? Is this another one of your illicit affairs? Or would you enter into an exclusive relationship with the God of Mischief? I don't take such things lightly. You would be mine." Loki promised, eyes flashing.
"Fuck, yes, I won't be bringing anyone home again. Not that I have for the last three weeks, but-" Tony stopped as Loki paused, mouth hovering above the spot on his neck that drove Tony crazy.
"You haven't brought anyone home in that long? What about before?" There was a slight accusation in Loki's voice.
"The time before that... I wanted to see if I could. It wasn't the same, I kept thinking of you, wishing it was you." Tony growled, face tinting.
Loki smirked and pressed Tony against his desk, hips moving, grinding into Tony's. A loud groan escaped both their throats, and then Loki was all over Tony, nipping, kissing, licking. Clothes disappeared and they both took their time exploring the other, under a new title. Mine.
A few days later...
Tony was working on a project, zoned out to the rest of the world as usual for the day, when the chair he was sitting on suddenly turned around and a pair of lips crashed onto his. Freezing in shock, he relaxed when he realized it was Loki.
"What's that about?" He gasped when the god finally leaned back to survey his work. Loki smirked at his expression.
"You were not paying enough attention to me. Now you're going to beg for it." He purred. Tony's eyebrows shot up, and he tried to ignore the stirring he felt at the gods words, but when Loki crouched on his knees, eyes intent on the growing bulge in Tony's pants, he didn't think it would be possible without bringing a god's wrath down upon him. And why would he do that?
Loki unzipped Tony's pants, smirking as Tony jerked. "Loki, don't tease me," He whined.
"I have a lot more in mind than just teasing, Tony." Loki whispered with a possessive glint in his eyes. Tony just groaned in response, eyes rolling into the back of his head as Loki grasped his cock in his hands, squeezing slightly. "Gods, that's-" Tony stopped mid sentence as Loki swallowed him whole, jerking up and hissing with pleasure.
Loki waved a hand and made Tony's pants disappear, then got to work ensuring Tony felt every little touch, caressing his balls, trailing his fingers down his thighs, and creating a maelstrom of sensation for Tony, who was helpless under its spell, twitching and moaning until a hand reached up to grip Loki's hair. Tony started thrusting his hips up slightly into the gods mouth, trying to create more friction.
"Loki, I'm going to- ahhh, I'm going to come!" He said, a high pitched whine in his voice. The god looked up at him as he bobbed his head, but slowed and then stopped, ignoring Tony gripping his hair in protest. Loki took his mouth off Tony's cock, letting his teeth trail briefly over the head of it before letting it slide out of his mouth. Tony sobbed for breath at the sensation, desperate for release.
"You will not come until I say so, Stark." Loki hissed.
"Loki- ahhh!" Tony practically shrieked when Loki reached and grabbed his cock, squeezing the sensitive member none too gently. The god made sure to create a magic ring around the base so Tony couldn't come. Loki stood up, looming above Tony until he bent down and nibbled delicately at Tony's neck.
"If you want to come tonight, you will behave. Otherwise I will take my pleasure of you until I am sated and then... then I will think about letting you come." Loki said, breath brushing Tony's ear as he leaned in. Tony shivered, not sure how much it would take before Loki would be satisfied. There were times when they would have sex continuously throughout the day, and Loki would still somehow want more.
Tony could only watch as Loki stepped away and with a flick of his finger, made both their clothes disappear. He writhed naked on the chair, his cock throbbing, moaning at the sight of Loki's cock, hard and leaking precome. He didn't look away as Loki held his eyes, whispered a few words and then reached one hand behind himself and- Fuck.
"Loki, that's... fuck." Tony moaned, eyes wide at the sight of the god stretching himself. Loki smiled, eyes glittering, before hissing and leaning his head back as his arm moved faster behind himself. He finally stopped, mouth opening in a silent entreaty, before his head snapped back up and he was suddenly moving to Tony, turning to position himself over his cock.
Tony reached up and grasped Loki's hips. "Wait, one moment. It'll be worth it." He whispered smoothly. He leaned his head forward, knowing Loki had craned his head to watch him confusedly, smirking before darting his tongue out and touching it to that puckered little hole. Loki gasped, and his muscles clenched. Tony again touched his tongue to the ring of muscle before slowly poking at it, breaching it carefully and swirling his tongue around. It was Loki's turn to writhe, not moving but his body giving little shivers of delight. Tony did this a couple more times before his cock throbbed and he stopped, only smiling as Loki glared at him in protest, pupils blown.
Tony gripped the gods hips and positioned him directly over his cock, before taking a breath and tugging Loki down as he thrust up. They both moaned at the sensation. They were far too close to drag it out, so Tony gripped Loki's hips, fingers tight enough to bruise as he helped him slide up and down on his cock.
Loki leaned back and ground his hips into Tony, moaning louder as Tony suddenly brushed that sensitive little nub inside him. Tony grinned and seized the advantage, thrusting carefully a few more times until he hit it again, and then making a point to brush it with every thrust. Loki was helpless against the onslaught, and soon his breathing was short and fast, he was gripping the desk in front of them with white knuckles, and his body began to tighten around Tony.
"Loki..." Tony gasped. "The cock ring.. take it away so I can come, please."
"What if I don't want to?" The god replied, clenching around Tony harder. He moaned when Tony suddenly stopped, moving away until Loki was just bobbing up and down on his member by himself. Growling, Loki looked back. Tony had folded his arms in front of him, and had a dark expression on his face.
"Then you can come on my cock, but you'll do it by yourself. I'm only here to provide the cock to fuck yourself on and that's it." He said coldly. Loki sighed and disengaged the magical cock ring preventing Tony from coming.
"There. Now stop throwing a fit and come in me. Mark me as yours," Loki practically growled, body throbbing with need.
"With pleasure," Tony hissed before grabbing Loki's hips in a bruising grip once again and thrusting up hard, hitting Loki's prostate. "I'm close," he grunted.
"As am I. Show me what I am, Stark." Loki whimpered as Tony began his assault on his body again.
"You're mine." Tony snarled, dragging Loki back until they were chest to back, the cold metal of the reactor scraping Loki's back as he shifted and moved with Tony thrusting into him. He moaned at the words and sensations as Tony attacked his neck and felt his balls tighten.
"Ah, Tony, I'm-" The god was cut off as Tony suddenly squeezed the base of his cock, preventing him from coming.
"Not until I say so." Tony said, still thrusting up into Loki. Loki whimpered, but the words only served to make him harder, and he knew Tony felt it by the way his breath hissed out on his back, until Tony was suddenly driving into him harder than before, and calling out his name as his cock jerked inside Loki and finally spurted his seed into the god.
Tony released his hold on Loki's cock, beginning to come down from his climax but still thrusting lightly into the god, his dick still half hard. He hit that nub again and again, spot on each time until Loki tensed and screamed, body tightening around Tony and cock shooting thick white strands into the air. Tony rode him through it before his cock jerked and he came again, a lighter load this time as he emptied himself into Loki, teeth biting the god on the shoulder.
They both stilled in the aftermath, chests heaving in tandem.
"Since the plan seems to have changed," Tony managed slightly breathlessly a minute or two later, "How about we go up to the bedroom and see what we can do about lasting a bit longer than that?"
Loki hummed in agreement, twisting around in Tony's arms to touch his face and press a kiss to his lips before there was a sensation Tony never got tired of, and they were suddenly on the bed, sprawled out across one another. Loki sat up and swung a leg over Tony's body lazily, fingers trailing a line down his chest to his stomach, and lower before Tony was hissing and arching up under him.
"Fuck, Loki, my recovery time isn't that fast!" He moaned with a helpless edge to his voice. Loki only smiled before his hands glinted green for a moment. Tony eyed his lover with suspicion until he suddenly felt every touch and caress as if he hadn't just emptied himself into the god sitting on him minutes ago. His cock jerked, already half hard, and Loki smirked in triumph.
"You bastard, what'd you do to me?" Tony groused with no real feeling behind it as Loki continued his administrations. Loki just smiled and made use of his title of Silvertongue, leaving Tony quite incapable of speech for the next couple hours.
Apologies for the late update! This week has been exhausting and the next update might be this coming weekend as I scramble to repair the work procrastinating has done XD I hope you like it!