A/N: Dirty talk and minor objectification. Stark Spangled Banner implied. Very NSFW.
"Hah, yeah, just like that. Fuck." The fingers in Bruce's hair tightened briefly before returning to their smooth, if frantic, strokes over his scalp. Bruce moaned at the slight sting, but didn't stop his current task. He bobbed his head down and took Tony in to the hilt again, swallowing around the thick shaft and making the other brunet buck up from the lab chair he was seated in.
Tony grit his teeth at the sensations and growled out curses under his breath, the words becoming increasingly obscene as Bruce started moving faster. "Hell yes, fucking love this," he moaned, moving one hand down to stroke Bruce's hollowed cheeks as he watched. "You take cock so good, baby. Fuckin' greedy for it. Such a good slut for me." Bruce whined and rolled his hips into empty air instinctively at the words, eyes silently begging for relief. Of course Tony noticed this and graciously nudged his shin between the physicist's legs.
"Come on, sweetcheeks, hump my leg," he half-ordered, mischief clear in his eyes, "I wanna see you cum while I have my dick down your throat." The doctor's eyes rolled back as he rushed to obey, for his own relief more than Tony's desires at the moment. Bruce was still fully dressed save for his shirt being unbuttoned, and Tony just barely had enough patience to get his erection out of his pants before he'd pushed Bruce to his knees, leaving the brunet no chance to relieve the pressure against his zipper before he was licking Tony like a lollipop. After so long with no relief to speak of, grinding on Tony's leg was pure ecstasy.
The engineer grinned down at him and chuckled lowly. "You like that?" he purred, pressing harder against the straining tent in his pants, "'Course you do, I bet you'd jizz your pants like a virgin if I kept talking like this, wouldn't you? Like you're my own personal fucktoy?" The shudder that ran through Bruce was enough encouragement for him to keep going. "I should've stuck a toy in you first, made you keep it in that tight ass of yours, or would you rather have a real cock fucking you. Steve would love to help me spitroast you, fuck you so hard you'd gag on me." Bruce was whining and moaning constantly now, unable to stop himself from wildly humping Tony's leg as he hurriedly bobbed his head and deep throated his lover. At least by now the pleasure was finally starting to get to the other scientist as well.
"Shit, sh-shit," he hissed, fisting Bruce's curls and forcing him all the way down on his cock, before grinding his hips into the brunet's flushed face as he moaned. "Fuck!" Tony gripped the doctor's jaw as he came, keeping him still as rode out his orgasm. "Swallow it," he ordered, looking down at Bruce with nearly black eyes. Fully intending to do that anyway, Bruce let the hot cum trickle down his throat, still open around Tony's softening cock, while he continued to rub off on Tony's leg.
When Tony was satisfied that the doctor had swallowed every drop of cum that hadn't already leaked past the seal of his lips, he pulled Bruce off him and moved his head to brace it against his thigh. "Come on, baby," he purred, petting Bruce's curls as the man gasped for breath and jerked against his shin, "Cum for me." A hoarse moan tore its way from Bruce's throat and he bucked against Tony once, twice, then he was spilling in his jeans, biting his lip and groaning while Tony cradled the back of his neck.
They came down from their high of endorphins slowly, Tony smoothing down his ruffled hair and Bruce nuzzling against the engineer's clothed thigh. "You okay?" Tony asked after a while, tilting Bruce's chin to make eye contact. Bruce smiled tiredly and nodded. "I could use some water, but otherwise I'm great," he assured his lover, voice more than a little rough.
Tony snorted. "I bet," he mumbled before standing, pulling Bruce up with him gently. "Come on, I think we both need a shower, and maybe a nap. You sucked the energy right out of me," he teased as he tucked himself away. Bruce smacked him on the shoulder for the pun, but smiled and affectionately replied, "Shut up, Tony."
A/N: If you enjoyed the smut and want more, please check out my tumblr (drbannerakahulk) and send me some prompts :)