Peter smiled down at his phone. Before they went their separate ways at Bottom Feeders, Tony had promised he would call or text, and Peter had promised the same thing, neither wanting a repeat of the miscommunication following Batavia. Tony had gotten into the habit of sending selfies throughout the day (and more obscene pictures at night), and Peter enjoyed seeing what the CEO got up to on a daily basis. Since they worked in different buildings, it was rare for Peter to see Tony for more than a handful of minutes, and usually from afar.

In this particular text, Tony had drawn a bowler hat with a flower in it on a small piece of plexiglass. He appeared to be in a fairly serious board meeting, but in the picture, he was holding the plexiglass up so the presenter looked like he was wearing the hat. In the background, he could see Pepper rising from the table to put a stop to Tony's pranks.

Still smiling, he set his phone down on his desk and got back to work. He was supposed to be working on a group project to increase the output of the efficiency of the Stark nuclear power plants, but all he could think about was that damned arc reactor. They really had been on the cusp of something brilliant. The arc reactor could have provided clean, efficient energy for all of the major cities worldwide, if only they could have synthesized a new, stable element at Fermilab. Instead, each attempt at colliding the elements in the particle accelerator had resulted in spectacular failure, and eventually they had to give up their attempts so the real scientists at Fermilab could get back to their own experiments.

He received a ping from one of his coworkers. All nuclear reactors used nuclear fission to produce power, meaning the heat energy produced from splitting a Uranium atom was converted into usable energy. Erik, the coworker, was insisting to the group that they should look into producing power through nuclear fusion, where two Hydrogen isotopes are combined into a Helium isotope to produce energy, the same way in which the sun produced energy. Most scientists had written this method off as dangerous and inefficient, but every once in a while, some hotshot thought he or she could revisit the subject and solve the problems once and for all. Peter chuckled to himself. Wasn't this exactly what he had been doing with the arc reactor? If Howard and Tony Stark couldn't solve the problem, what made Peter think he could—?

Hydrogen!

In a flurry of motion, Peter gathered his belongings and rushed from the office.

"Where are you going?" Shuri called after him.

"I have to see Tony!" he called back.

It was pouring as he exited Tower II, but that didn't stop him as he raced the two blocks to Tower I. On his phone, he texted, I have to see you—now!

cum to my office, beautiful

Peter rode the elevator to the top floor, all the while biting his lip anxiously and resisting the urge to push the button several more times. Hydrogen! How could they have missed it after all these years? The answer was simple, obvious: They didn't need a larger element, they needed one that was—

"Smaller!" Peter shouted, bursting through the doors to Tony's office. "Oh. Why are you naked? Should I come back later?"

Tony was laying sprawled across the top of his desk, everything that had been atop it having been shoved to the floor. His clothes were strewn unceremoniously across the room. Tony was obviously unperturbed that it may not have been Peter coming through the door…or that there were floor-to-ceiling windows lining the wall behind him.

"You said you needed to see me," Tony responded by way of explanation.

"Well, yeah, but—about the arc reactor, not…"

Tony was stroking himself, clearly tuning Peter out. "Don't tell me your text wasn't an emergency sex summoning. I left a very important meeting for this."

Peter was cowed. "Tony, I'm so sorry. I didn't mean for you to leave a meeting. I just thought—"

Sliding from the desk, Tony prowled towards Peter and drew him into a heated kiss. "Never mind my meeting; I leave them all the time. Now, I put on my Sunday finest for you. Are you going to accept my invitation, or are you going to leave me embarrassingly hard?"

Glancing nervously at the door, Peter whispered, "What if someone walks in?"

"Don't worry about that. JARVIS won't let anyone in."

"Who?"

"Later."

Peter had gradually melted against Tony and conceded to him slowly removing his suit jacket. "Not the floor," Peter murmured as he placed gentle kisses on Tony's neck. "That's not polyester."

Tony snorted. "I'll buy you a whole wardrobe of Italian wool if it gets one wrinkle in it."

Perfunctorily, Peter removed the remainder of his suit, draping the pieces carefully against the back of a chair. Greeted with flawless skin, Tony was unable to resist running his hands along Peter's sides, his arms, his chest.

Shivering in the air conditioned office, Peter smiled demurely. "What would you like to do to me, daddy?"

Tony took a step back and took in the whole picture appreciatively. "Bent over my desk would be nice, doll."

Complying, Peter rested his forearms against the lacquered wood and thrust his hips backward, his legs spread wide. Tony approached from behind, admiring how Peter's heavy testicles hung as enticingly as forbidden fruit. Half hard, Peter's cock plumped nicely, pointing at the ground, peeking into view as Tony circled predatorily. One hand reached out to touch, gliding along his back before taking a handful of meaty ass flesh and squeezing.

"Can I fuck you?"

Peter rocked his hips back even further, stretching so his ass stuck out as far as he could manage. Using his hands, he spread his cheeks apart, giving Tony an unimpeded view of his pucker.

"I'll take that as a 'yes.'"

A moment of rustling as Peter held his position as best he could, the air conditioning causing the fine hairs all over his body to stand on end. When a cold finger pressed against his hole, a shiver raced up his spine.

"Oh, baby boy, I didn't realize the lube would be so cold!" Tony apologized.

"No, it's—oh…"

A finger had slipped inside, tender as anything, letting the eager walls pull it within. A slight withdrawal before that finger was once more drawn further inside. "That feel good?"

"So good…"

"You just stay there and let daddy take care of you. Let me know if your legs get tired…"

"Uhn…"

"So hungry, huh? Wish you could see what I could… You're just pulling me inside. Gonna get you nice and ready for my cock, baby boy. Gonna make it so good for you…"

"I'm ready, daddy!"

Tony chuckled. "So impatient. You're not even close to ready. You think I'd just shove my way in? I wouldn't dare ruin you. You're so perfect. But I will"—he pushed a second finger inside—"make you feel so good in the meantime. How's that, baby boy? That feel good?"

"A little to the—oh, there it is…!"

"Yeah? God, keep moaning like that, and I'll cum before I even get inside you."

"I can't wait for you to mark me up again."

Tony's hand stuttered, and he had to take a moment to breathe. "I've got to get my mouth on you. Can you lay on your back on the desk, or is that too uncomfortable?"

"I can try it."

After Tony withdrew his hand, Peter laid back on the desk, giggling at the thought of defiling something that undoubtedly cost more than three months' rent. He shimmied so he was lined up exactly with the edge, then propped both feet up so his spread legs displayed everything. Tony replaced his fingers but instead of taking his cock in his mouth like Peter had expected him to, Tony's mouth explored his inner thigh, taking the time to meet every inch of skin. When he had thoroughly worshiped the one thigh, he moved on to the other leg, repeating the process again. His fingers probed and massaged, working Peter open completely, and turning him into a boneless mess.

"Tony…" Peter whined. "Would you please fuck me already?"

"Almost," Tony promised, letting his beard tickle Peter's ankle. "How do you feel about feet?"

Peter's jaw clamped shut. Feet were not his thing, but he wasn't about to let Tony know that and ruin the mood. He had only made that mistake once in a previous relationship. A previous boyfriend had been really into spanking, but when Peter had mentioned he didn't like it, the boyfriend got really upset and had threatened to break up. Since then, Peter had gotten into the habit of just letting his boyfriends play out their fetishes and kinks, and if he didn't like it…well, it would be over eventually.

"Peter?"

"Hmm? Oh, it's fine. I like it if you like it."

Tony's hand stopped, and he carefully withdrew it. He stood and leaned forward until he hovered over Peter, purposefully meeting his eyes. Nervously, Peter looked anywhere but Tony's face. Had he messed up again?

"This is the second or third time you've said something that's a little concerning to me."

"I'm sorry. I'll do better. I promise." He tried to coax Tony back to him but to no avail.

"I need you to feel comfortable enough to verbalize what you like and don't like. If I do something that you don't like, you need to speak up. Advocate for yourself; no one else will."

"Okay."

"You don't sound convinced."

Peter opened his mouth to reply, but Tony must have sensed his reluctance. "Look, this is clearly a conversation we'll need to have in depth at a later time. Honestly, it's unfair to both of us that we haven't had this conversation yet. But for now, I just need to know are you okay with"—he gestured broadly—"all this. In the moment. Right here." He motioned between the two of them. "Us."

This time Peter didn't hesitate. "Yes."

"Then we'll put a bookmark in our conversation, and I'll try to keep this as vanilla as possible until we can discuss it further. But…" He kissed Peter tenderly on the lips. "Tell me if something doesn't feel good, doll."

More kisses as Tony worked them back up to the previous level of passion. Peter was urgently rutting against Tony before he finally went back between Peter's legs to finish prepping him. Tony took Peter's cock in his mouth as he gingerly worked a third finger inside.

"Ah…"

"Good 'ah' or bad 'ah'?"

"A 'I feel really full "ah."' Mmm… Feels good, though."

"Yeah?" He kissed the backs of Peter's thighs. "Gonna get you nice and loose before I fuck you. How bad do you want daddy's cock?"

Peter bucked his hips against Tony's hand. "I've wanted it since I first laid eyes on you. Fuck, I would have let you bend me over on that dance floor at Bottom Feeders and fuck me in front of everyone. Sometimes I fantasize about you surprising me in my office and fucking me while I work." Peter realized he was rambling but couldn't stop. "I think about you all the time. I wear your shirt at night while I touch myself."

"Yeah? You have a nice, big toy that you use? Do you work yourself open wishing it were me there to take care of you, baby boy?"

"Yes. A toy just isn't the same as your hand, and I know your cock is going to be even better—"

Peter broke off with a whine as Tony lined himself up with Peter's hole. "I'm going to go slow. Tell me if you need to take a break."

A deep moan tore from Peter as Tony finally fit inside. Tony had spent so much time with prep that he had no problem going all the way in. When he bottomed out, Peter breathlessly asked Tony to wait, already so worked up that his body was aching to cum, like a pressed spring ready to expand.

Tony kissed Peter, also needing a moment to calm down, and he sighed blissfully at the feel of Peter's tongue against his. Tony had felt on top of the world when Peter said he was the main topic of his fantasies and daydreams. As often as he thought about Peter, he was pleased to know he was thought of in return.

But what was with Peter's deflection earlier? Tony was beginning to piece together that Peter may not have been completely open and honest with him since the beginning of their whirlwind of a relationship. Perhaps Peter hadn't had the healthiest of past sexual experiences. Maybe he never had a relationship where both parties felt comfortable enough to talk things out frankly and healthily. Maybe what Peter needed was an older mentor who was more experienced and willing to teach Peter how to be open and honest about his likes and dislikes. Maybe what he needed…

…was a daddy.

Tony shivered pleasantly as he gazed down at the young man spread beneath him. Peter's head was tilted to the side, his eyes closed and his mouth working as he let out little pants and moans. The fleshy column of his throat was left exposed, begging to be marked up, and Tony felt he had no other choice than to oblige. He started with tender kisses, finding the spots that had Peter squirming just as Tony began to move his hips again. The quicker his thrusts became, the harder he sucked on Peter's neck, aching at the thought of the deep purple marks he intended to leave there. Peter arched into his mouth, turning his head this way and that until Tony finally reached a spot just behind his ear that had him practically shouting in pleasure.

Peter's legs were beginning to tire, having been propped up on the edge of the desk for such a long time, but he wasn't about to give in to a little leg cramp when he finally had Tony inside him. Using the desk as leverage, he pushed into Tony's thrusts, driving him even deeper inside him.

"So good, Peter… You're so tight—ah!"

Peter clenched and unclenched as he rocked up into Tony. His hands roamed Tony's sides and chest as he appreciated the tight, toned flesh. Arousal raced through his body, igniting every nerve ending, as he desperately pressed himself as close to Tony as he could get. "Fill me up, daddy!"

"You're—"

"Uh—"

Tony slammed his lips back against Peter's, desperate to convey his feelings but not yet ready to voice them aloud. His hips stuttered, losing their rhythm, lost completely in the sensation that was Peter Parker. When it became clear he was nearing the edge, he pulled back, panting, squeezing the base of his cock to stave off orgasm for the time being.

"What do you say to moving this over to the wall?"

Peter glanced at the large windows Tony had gestured to and frowned. "What if someone sees?"

"You can't see in these. Only out."

"…You're sure?"

"I designed them that way, so, yes. They're completely opaque from the outside. See? If you turn your head at an angle like this, you can see the different layers of glass, and you can see the tint."

Peter placed his hands on the glass and tilted his head. Tony was right; the glass was tinted. He recalled Tony insisting that if he didn't feel comfortable with something to just speak up, but surely fucking in a club bathroom had a greater risk of being seen than fifty-five stories in the air.

"Go ahead," Peter assented.

Tony kissed him between the shoulderblades, then gripped his hips to position him more comfortably.

And suddenly, Peter was flying.

From this angle, it seemed like the glass had disappeared and that he was soaring past the skyscrapers in Manhattan. His stomach swooped with the illusion, made even more intense by the utterly unreal sensations Tony was pouring into him.

"I'm flying," Peter whispered breathlessly.

"I've got you," Tony replied. "Spread your wings. I'd never let you fall."

The sun shone brilliantly between the clouds, and Peter watched a plane glide seamlessly through the atmosphere. He thought of Icarus and his wax wings and prayed that he himself hadn't flown too close to the sun.

"Where'd you go? Come back."

"I was swinging between the buildings, holding on to a gossamer string."

"Sounds nice." Tony kissed Peter's shoulder. "I get the same feeling when I stare out this window. I feel like there's an alternate universe somewhere where I fly through the city with a jetpack and just…help people." He drew Peter into his arms and held him. After several moments, he suggested, "Let's move over to the couch. I don't want you thinking about anything other than me."

They moved over to the couch, and Peter pushed Tony onto his back before straddling his waist. Tony held his cock by the base so Peter could sink down on it. Peter took a few test bounces before settling into a rhythm he could manage. Tony groaned and ran his hands along Peter's thighs before gripping them tightly as he tried to hold himself in the moment.

Peter held the position as long as he could, the sound of their flesh connecting filling the room. Eventually, he slumped forward onto his hands, taking the pressure off his knees and regaining his sense of balance. Tony caught his lips in a kiss, drawing a throaty groan from Peter.

"I can't get over how you taste, beautiful."

"I can't get over how well you fuck me, daddy."

Tony chuckled. "Of course. I have to take care of my baby boy, don't I?"

Peter ground back against him, pressing Tony as deep into him as he could. "You take very good care of me."

He gasped as Tony thrust upward unexpectedly, taking over the pacing. Tony's arms tightened around Peter's lower back as he pounded upward, wringing the loudest possible moans from Peter. Peter's cock bounced against his stomach, and he gripped it, getting copious precum on his palm in the process.

"Ah—"

Tony slowed down, and Peter took over the pace again, righting himself once more so he rode Tony more properly. He alternated between rolling his hips and bouncing more deliberately, using his legs as leverage.

"How are you feeling, Peter?"

"S—So good…"

Once more, Peter draped forward, his entire body buzzing with anticipation. He shook as he desperately rutted against Tony's cock, mouth slack with the pleasure of it pressing in all the right spots. His hand flew to his cock, and he was unable to keep from jerking furiously, desperately chasing his climax.

"Getting close?"

"Nnh—"

Tony did his best to meet Peter's erratic thrusts, striving to give Peter as much pleasure as possible. He whispered a stream of encouragement directly into Peter's ear before sucking once more on his neck right behind his ear.

Peter came with a shout, splashing clear up his and Tony's chests. He panted heavily as he came down, Tony stroking his back and kissing his shoulder before pulling gently out. Bonelessly, Peter rolled onto his side, cradled between Tony's chest and the couch cushions. Still hard, Tony jacked himself off as he ran his other hand lazily up and down Peter's side.

Still dazed, Peter made an up and down motion with his hand as he asked, "Want me to do that?"

Tony kissed Peter's cheek firmly as his hand sped up. "No, doll. You just sit there and look pretty. Maybe let me grope your ass."

Peter giggled as Tony squeezed him playfully.

They lazily kissed, Peter humming contentedly as Tony worked to bring himself over the edge. His breathing quickened and his hand tightened on Peter's side as he tensed up, finally spilling over his hand. Taking a moment, Tony got them cleaned up before curling back up on the couch with Peter.

"That was absolutely incredible." The way Tony said "incredible" was slurred as he started to fall asleep. "You were incredible."

"Mmm…" Peter felt his eyelids growing heavy. Tony was so warm and firm beside him that he knew he'd begin to drift off soon. Part of him nagged at him, that maybe it wasn't the smartest idea to fall asleep completely naked in your boss's office, but the larger part of him had stopped fighting to stay awake.