Sam only heard it because he'd been taking a nap on Steve's couch.

Well, his couch.

Some random Thursday a couple of months ago (six months and four days, but who's counting?) Sam had come home to find a very large, solid yet soft, red and black couch taking up most of his living room with his old couch nowhere to be found. At the time, he hadn't bothered to question it. Mostly because the colors of said couch told a very obvious tale.

At least, he'd thought so right up until he had actually visited Steve's new apartment at the Tower. The blond had made lots of "Oh, how did that get there," motions, but Sam knew the truth:

That Steve had had the damn thing so long that he'd forgotten that he'd stolen it.

Anyway, Sam was napping on what was now Steve's couch.

He was startled into awareness by a sharp thud against the wall behind him. Sam found himself rolling up and over the back of the couch before he was even awake enough to register that he was no longer sleeping. He woke up properly a couple steps away from the couch and frowned slightly in confusion.

Another thump, even louder this time, reminded Sam of what he gotten up for. Oddly enough, the room right behind the living room was the full bath (Sam honestly wasn't sure if that was a sign of laziness or pragmatism, but he wasn't about to complain). He knocked lightly on the door three times. "Hey. Everything okay in there?"

There was a long pause at that. "...Stuck," came Bucky's voice, caught on the tail end of a sigh.

Sam checked the doorknob and found it thankfully unlocked. He peeked inside and, rather than being stuck inside of a... something (he didn't even know what he had been expecting, a drain?), Bucky had the fingers his metal hand twisted through his hair.

Naked, soaked, curled up and staring up at him through a pair of stupidly long eyelashes made Bucky seem like a really forlorn looking cat.

It was fucking adorable.

Sam bit back a smile and made his way over to the large tub. He sat down at the edge and took the metal arm in one hand, gently untwisting chocolate colored strands from between the fingers.

"What happened, man? This can't be the first time you've washed your hair recently."

Bucky curled in on himself further and Sam felt more than heard the sigh that escaped. He wasn't sure if the man was feeling guilty or frustrated, but paused for a moment to rub gentle circles in Bucky's scalp. Bucky immediately leaned back into it and Sam huffed out a laugh.

"I usually do it one-handed. Just...forgot, I guess. Didn't think it'd get this bad."

Sam tried to imagine washing this hair one handed. It was doable, but his arm was aching just thinking about having to do that. So he said as much.

"Seriously, man. There's no point in punishing yourself like that. I'd rather just do it for you."

Bucky tilted his head back and blinked wide blue eyes up at him. "Really?"

Well, not really. But fuck if Sam intended to take those words back with this guy staring at him all hopeful and pretty and...wet. Shit.

Sam turned his attention back to actually untangling Bucky's hair, with the focus of a man attempting to disarm a bomb. "Sure. Why not?"

Bucky smiled shyly, really just a small upward quirk of the lips, and if his normal smile was even half as warm as that one was, Sam could see why Steve'd been so lost on the guy for so long.

Once he'd finally managed to free Bucky's hair from his arm, he grabbed the shampoo bottle, one of those gentle Berry Blast shampoo/body wash for kids type things that Natasha kept switching Steve's soaps out for, and got to work. By the time that he was finished, Bucky had uncurled himself and slumped down so far that he was basically lying down on his side in the bathtub, leaving Sam to kneel next to the tub to reach him properly.

Sam was pretty sure the man had just fallen asleep on him.

Really deeply asleep, actually.

So deep that he hadn't woken up by the time Sam had finished. So deep that he didn't wake during the laborious ten minute journey that it took to drag the man up out of the tub, dry him, carry him to his room, and put him to bed.

It was possible that Barnes was faking it. If he was, he was damn good at it.

-xxxx-

It developed into sort of a habit, Bucky calling Sam over once or twice a week for a spa day. On the fourth time, Bucky had taken hold of Sam's hand when he'd reached for the shampoo.

"Let me do yours."

Sam glanced at him, at his own face in the mirror and back again. "Not much to wash there, buddy."

Bucky shrugged and reached up to run his flesh hand lightly over the short tuft of hair on Sam's head. "It feels good. So why not?"

He didn't actually have an answer for that.

So, with a shrug, Sam stripped down to his boxers and climbed into the tub in front of Bucky.

Having Bucky wash his hair was an interesting experience. It was less washing his hair and more playing with it. He would twist the short hair into little curls. Huff out a silent laugh then untwist them. Then rub some more shampoo into his hair. Neither of them had actually physically washed themselves yet but more than half of the bottle was already used up.

It was worth it though.

-xxxx-

Bucky sat in the tub with his arms folded across the edge as Sam kneeled behind him, half bent over, and combed some conditioner through Bucky's hair, two inches longer now than it had been when they'd started the ritual a couple weeks back. Bucky was naked (he saw no point in wearing clothes inside of a bathtub), though Sam was still wearing his boxer shorts.

Sam was actually pretty focused on tugging out a particularly aggressive looking knot without creating a bald spot. Which meant that he didn't immediately notice that they weren't alone. So one moment they were just two guys platonically washing each others' hair like bros, the next moment they were two guys naked and wet and soapy in a bathtub, probably as a precursor to amateur porn.

They stared at each other in silence for a long moment and Sam could actually see Natasha running all of their recent public interactions through her head and compiling a conclusion. She seemed both happy and unhappy with her results, a small smile building on her lips even as her brow crinkled. She let herself lean against the doorway.

"So, how long have you two been a thing?" She asked, trying for something light and teasing.

Sam rolled his eyes. "We're not a thing. This is a thing. I wash his hair," Sam said, tilting his head in the direction of Bucky's metal arm, "and he pretends to wash my hair. Everyone's happy."

Natasha blinked, honestly surprised. "Oh," she said, her voice soft.

Sam gave her a smile and patted the floor in front of the tub next to Bucky's folded arms. She raised her eyebrows at him so Sam raised his back. After a moment, she relented and came over and sat herself down carefully against the edge.

Sam placed a hand on her forehead and tilted her head back so that he could give her a wide smile. She smiled softly in return and closed her eyes. He got to work on her hair, a little surprised at how soft and well maintained she kept it. Though he probably shouldn't have been thinking of the illustrious Black Widow's grooming habits in comparison to other assassins like the Winter Soldier, who didn't have grooming habits, and Hawkeye, who…somehow had worse grooming habits than Bucky.

One thing he could say, however, was clearly all assassins basically turned into lap cats under a decent head and shoulder massage.

-xxxx-

There was less than 48 hours between when Natasha joined their group and when Steve walked in on them for the first time. It shouldn't have been surprising. They were on his floor, in his main bathroom, in the middle of the day.

Steve had simply walked into the bathroom without knocking and started with, "Bucky, have you seen my good comb? I thought I'd left it in the other bathroom but I can't for the life of me figure out where it went." Steve was leaning over the counter, already rooting about in the large medicine cabinet above the sink when he seemed to finally register the fact that there was more than one person in the room with him.

Steve stilled and the squinted at the mirror for a moment turning to face them. Sam was still in his boxers but Bucky and Natasha were both stark naked (because body positivity combined with a distinct lack of modesty was another thing all assassins shared). Steve blinked at them slowly. After a moment, his expression morphed into something like curiosity and an irritating amount of amusement.

"Huh. Didn't know you had a type," he said.

"Oh my god! Can't a guy just engage in some platonic hair washing without everyone thinking we've got shit going on?"

Natasha tilted her head back to glance at Sam with a suspiciously innocent smile. "So that's a no to the full body dazzle massage?"

Steve grinned widely at that, his eyebrows up to meet his hairline. "Is that what the kids are calling it these days?"

Sam clamped a hand over Natasha's mouth before she could speak and before he had a chance to think better of it. "No, that's not what we're calling it- I don't even know what the hell that is!"

"It's a full body massage with exfoliating glitter body oil," Bucky offered simply.

Sam couldn't tell if it was a sign of progress or corruption (Natasha induced? Tony induced?) that Bucky knew that.

Steve let out a soft hum, actually sounding interested. "That's not uncomfortable? For places?"

Bucky shrugged lightly without lifting his head. "The glitter's not that big and they don't put it inside you. There's a shop off of 16th, if you're interested."

"Sounds fun. We should stop by some HOLY SHIT, NATASHA, WHY?"

Sam choked out a laugh, only barely having gotten out of the way when Natasha picked up the showerhead and aimed a blast of cold water at the clothed Captain. Steve let out a sound that was part horror at the betrayal and part revenge and dashed at the tub. He put one of his stupidly large hands over the nozzle causing the cold water to be sprayed back at the three of them.

While Steve and Natasha fought over the showerhead, Sam shifted around them to try to get out of the freezing cold. Bucky caught his eye and then glanced at the shampoo that had fallen to the floor in the tussle.

Sam loved Steve but Natasha was his shower bro now and bros had to stick together, right?

The sharp full body shudder and high pitched hitched gasp that he got from pouring half the bottle down the back of Steve's slacks was almost worth being grabbed in a bear hug and having that shower head (still blasting stupidly cold water) shoved down the front of his boxers.

Sam also learned that all assassins were totally fucking useless when they were laughing disloyally at his suffering.