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Tim hooks one finger under the fabric of the Robin suit shorts and pulls them back into place. He knows they aren't, but something about the shape makes it feel like they're constantly riding up his ass. He feels incredibly exposed like this, he can feel the chilly air to the very tops of his thighs in stark contrast to the thick material of his Robin suits tights. He'd worn this suit once before, but he'd been much younger at the time and less focused on what he was wearing than he was on saving Bruce and Dick so his bare thighs had hardly crossed his mind.
Like this though he's acutely aware of the difference, especially knowing why Dick is lending him his old costume. He looks in the mirror one last time (it doesn't quite fit, a little loose around the shoulders), making sure everything is in place, before he steps away into the bedroom.
Dick looks up at him as soon as he crosses the threshold and just stares. His expression is blank, almost uncomprehending, his eyes seem unable to focus on one spot as he takes Tim in. Tim knows Dick asked him to do this because he thought it'd be hot, but Tim feels very suddenly insecure. He tugs at the shorts again nervously and looks anywhere but Dick.
"I can go change- This was a bad idea, I'll just-"
"No." Dick sounds like he wants to continue but doesn't for a pause, eyes still trained intensely on Tim. "Don't change, come here." Tim doesn't exactly feel a renewed sense of confidence, but he does walk over to Dick to stand in front of him. Dick lets his legs fall apart so Tim can step between them, so close that they're nearly touching.
Without saying anything Dick drags two fingers up Tim's thigh, staring at them as if mesmerized until they push against the fabric of the shorts and slip under the hem. Tim shudders at the feeling of Dick's fingers on the cleft of his ass. The shudder makes Dick smile -self-satisfied - but he doesn't look away from his fingers.
He pulls his fingers away from Tim's skin, bringing the fabric with it, before letting go and letting it snap back in place. The fabric isn't stretchy enough for it to sting like an elastic would, but he definitely still feels it, especially as high up on his thigh as it is.
"You're so cute like this Tim, wearing my clothes." Dick still doesn't look up at him, even as he says it. Tim had forgone the cup and if Dick keeps on like this he's going to be watching Tim's cock push up against the tight fabric at the front of the panties pretty soon.
Dick's hand snakes around to Tim's backside and pushes under the fabric there too so he can press a dry finger against Tim's hole, the sudden movement makes Tim jolt, pushing him up against Dick's front.
Dick finally, finally looks up at Tim so he can smile smugly, rubbing his finger in circles but not pushing in even a millimeter. Tim can't help but squirm.
"You know, it's such a shame you added pants to your suit, your thighs look incredible in this, you'd practically be doing the people of Gotham a service." Dick's brows draw together as he says it before he adds "on second thought, maybe it's best we keep this just for me. Right Tim?"
This is a very familiar moment for them, one Dick is constantly repeating and never tired of. Tim says, overly-serious and devoted "Only for you Dick. No one else." and Dick shivers, same as he always does when Tim says anything to that effect.
He repeats no one else under his breath with a smile and rests his free hand on the front of Tim's thigh, rubbing gently just centimeters away from where Tim's cock is aching in the too-small shorts.
"Dick, come on, I'm going to ruin these if you don't get my dick out soon." he practically whines it, but he can't find it in himself to be embarrassed when he knows what it does to Dick. Right on queue Dick's expression goes dark and intense and his nails dig into his thigh just the slightest bit.
Dick looks up at Tim with a mischievous look on his face and tells him "Oh we're going to ruin them. Don't you worry Timmy." and finally - finally - he moves his hand to cup Tim through the shorts.
Tim lets out a moan when Dick digs the heel of his palm into his cock through the fabric, rubbing cruel circles into where he's most sensitive until Tim is a whimpering mess, forced to brace himself on Dick's shoulders with his head hanging in the space between their bodies.
"Come on Dick" he parrots once again, just more desperate and breathy. "Touch me for real." Dick cocks an eyebrow at the weak attempt at a demanding tone, but then Tim knows he seals it with a "please" only just barely off the edge of begging.
Dick's eyes jump up to look at Tim's face, which must be sweaty and flushed at this point. Dick looks to be a mix between amused and unbearably turned on and he proves it when he says with a laugh "I think you can ask a little nicer than that Timmy."
Tim roles his eyes and fakes a moan "Oh Dick~ won't you please touch my co-" Dick finally pushes the finger that's been circling his asshole in just the tiniest bit, cutting Tim off and making him moan for real. It isn't ideal, his finger is still dry, and he only really pushes it in past the tip of his nail, but after the unending teasing it feels monumental.
Dick laughs at him, just off the edge of mean, and says "see? When you're polite you get what you want." He pulls out just as quickly as he pushed in however, and stands and pivots so he can push Tim on the bed. Tim bounces a little on his back and he finds himself once again feeling so exposed. He can't believe Dick used to fight crime in this thing, he feels tiny and vulnerable under Dick's predatory gaze and he shivers at the attention.
Dick doesn't crawl on top of him like he usually does, instead he stays hovering, emphasizing how he towers over Tim like this. He pushes one hand past the waistband of Tim's shorts and at last gets his fingers around Tim's cock. He pulls it out past the waistband of the shorts, the waistband digs in uncomfortably and puts pressure on the sensitive skin. Dick leans over Tim so he can start undoing the clasps of the tunic with his free hand, motions practices and swift even all these years later.
When his chest is revealed, framed on both sides by red fabric, Dick tweaks a nipple almost mindlessly and says "We should have done this when you were still Robin. Can you imagine it Timmy? I'd chase you across the rooftops and when I caught up to you, because you know I always do, I'd pin you to a roof access door and undo your suit just enough to fuck you. I'd leave you straining in your cup and fuck you until you came from just my cock and then we'd go back to patrol with you full of my spend and your cup sticky with your own release."
Tim gasps and thrusts up into Dick's hand, shaking and whining spread out on the bed. There's no doubt in his mind that he looks indistinguishable from the Robin roleplayers prevalent on porn sites, his chest is rising and falling rapidly with every breath and on each stroke of Dick's fist his hips thrust off the mattress. With the tunic open his flush must be visible all the way to his chest and with the way Dick's twisting his nipple he's sure his chest will be even redder soon.
While keeping his hand on Tim's cock, Dick kneels down so he can get his lips on Tim's thigh, right below the green panties. He continues to stroke Tim's cock as he sucks a series of bruises into the tops and insides of Tim's thigh, pushing his legs apart to fit his head between them as he pleases.
Dick pulls off for just a moment so he can smirk up at Tim before he pushes his head back between his thighs so he can bite down hard right as he rubs his thumb against a particularly sensitive part of Tim's cock. He comes with a shout, curling up on himself before collapsing back on the mattress. Dick strokes him through it and keeps Tim's cock in hand so he paints cum all over his chest and the still open tunic. Now he really must look a mess.
Just as Tim is coming down, Dick climbs back up onto the bed and pushes Tim's thighs up to his chest, the new position shifts his cock and he groans against the over-stimulation, but he's too loose and tired to do anything about it.
Dick finally removes his cock from his pants and when he does it's red and weeping, desperate to be touches. Dick rubs a hand over Tim's chest until his hand is slick with Tim's cum, then he strokes his own cock with it and rubs the rest over the backs of Tim's thighs. He lines himself up and begins to thrust in and out of the tight little gap between Tim's thighs right over his over-sensitive cock.
The skin almost chafes with how quickly Dick thrusts in and out, the small amount of semen coating his skin not nearly enough to smoothen the glide, but Dick carries on, heedless. Tim watches him contentedly and lets Tim use his lax body any way he can see fit. When he finally comes he clenches his hand over Tim's thighs and pushes them together, which leads to Dick spurting cum all over the panties and Tim's abs.
When he's done Dick collapses forward, crushing Tim under his weight and making him groan irritably. Dick's just making an even bigger mess than they already did. He can't believe he let Dick ruin the Robin costume like this. He better have an idea in mind to get any staining out.
He relays this to Dick and Dick responds "are you saying you don't want to do that again? Maybe we can see if I still fit in it."
Tim mumbles hastily "I didn't say that." as he pictures the tunic straining against Dick's broad chest. Definitely not saying that.