Summary: Seijuurou got in a fight with Kou and ended up with Rin. Even though Rin is a bastard and a half, and they fight constantly. Especially in bed.

Disclaimer:Wilder still doesn't own Free!/Rin/Seijuurou/a life.

The Next Best Thing

"Will you stop pretending I'm my sister?" Rin snarls, but it's not very intimidating, considering that he is naked on his knees and elbows with his ass in the air. "The fact that she ditched you because your dick isn't as impressive as your biceps does not mean you can – " His tirade is cut off by a wordless moan as his captain's fingers curl inside him, and he hides his face in the pillow.

"I am not pretending that you are your sister. I was nice to your sister. And oh really, is that why she and I didn't work out?" Seijuurou asks, raising an eyebrow. "Funny, I haven't heard you complaining."

Well. Rin does have a tendency to complain. But not about that.

Rin's answering growl turns into a low whine in his throat, and one hand twists into the sheets while the other moves toward his own cock. Seijuurou swats the hand away and shakes his head.

"I decide when you come."

Rin kicks him in the head.

Seijuurou retrieves Rin's belt from the side of the bed and tightens it around his wrists behind his back before shoving his fingers roughly back in.

"Bitch," Rin mutters. He has to bite the sheets to resist moaning when Seijuurou's free hand comes down on his ass in a sharp slap. And now he's going to have to buy new sheets or learn to sew.

"What was that?"

"I called you a bitch," Rin snaps, trying to pull free of the belt so he can punch Seijuurou in the face. He only succeeds in making Seijuurou laugh and thrust his fingers in deeper. "Fuck you," Rin groans, but he wants it.

No matter how much he would love to break a couple of Seijuurou's teeth, he's pretty all right with the fact that they fuck. Even if Seijuurou probably does wish that it was Rin's sister instead of Rin himself.

"No, I'm pretty sure you're the bitch here," the captain chuckles. "Now, I'm pretty sure you want me to fuck you, but you're going to have to ask nicely. Capable?"

Rin turns his head to glare at Seijuurou, who smiles broadly back.

"Or maybe I'll just play with you until you come, hm? Would you prefer that?"

"… No," Rin says, and he shudders when Seijuurou smacks him again, harder this time.

"What do you want?"

Currently, Rin is extremely pissed off and what he wants is to kick Seijuurou in the gut, wriggle out of the goddamn belt, and finish himself off. But if he tries to kick Seijuurou, his current lack of arm support will cause him to tip over and probably fall off the bed, and Rin is not a fan of being laughed at.

"… I want you," Rin growls, frustrated as hell and positively aching, because obnoxious as Seijuurou is, he's a damn good fuck and Rin is very, very ready.

"I don't believe I know what you mean. Be specific."

"I want you to fuck me." Rin spits the words like they're acid.

"Little more detail, please."

Rin bites his lip and tries to figure out if this bullshit is worth it. If he does say no, let me go, go away, Seijuurou will. He's not a bad guy, really, he just really likes driving Rin crazy. And making him say things that turn his face as red as his hair.

Rin takes a deep breath and wills himself not to blush like a fucking schoolgirl.

"I want your cock," he groans.

"Go on."

Are you fucking kidding me.

Rin would love to scream at him, punch him in the face, maybe take control and fuck him for once, but those things are not going to happen today and at the moment Rin would like to be fucked already.

His best bet is to sound as passive-aggressive as possible and hope that it keeps the humiliation down.

"How much of a fucking idiot are you that you need this spelled out, Seijuurou?" he hisses. "I want your cock in my ass and I want you to pretend you're good in bed when you fuck me." His strategy does not work. Rin can feel the heat in his face.

"Well now you're just being rude," Seijuurou says.

But he rises on his knees, knocks Rin's long legs apart a little bit, and grabs the bottle of lube to slick his cock, pumping himself to full hardness. He grips Rin's ass, spreading him to give Seijuurou a better view, and presses his cock against Rin's entrance without pushing in just yet. Rin growls with frustration and tries to grind back against Seijuurou, who holds Rin's hips tightly so he can't.

Maddeningly slow, Seijuurou starts to slide his cock into Rin, pausing at every inch until Rin screams at him and he claps a hand over Rin's mouth. Rin bites him hard enough to draw blood as the movement causes Seijuurou to thrust all the way into him without warning.

"Ow! You little – "

"Quit teasing me, you son of a bitch," Rin tries to growl, but it comes out more like a breathless moan.

Seijuurou looks around for a moment, finds Rin's school tie on the bunk ladder, and gags him tightly enough that he shouldn't be able to bite through it.

"For the love of god, shut up," he says, and he starts to thrust into Rin, enjoying the muffled moans and panting through the gag. Seijuurou curves over Rin's back, biting his neck and shoulders, marking him because he wants everyone to know that Rin Matsuoka is his. Rin's protests are lost in the tie.

And sure, sometimes Seijuurou wishes that he were with Gou instead of Rin, but he could never have been this rough with her, and he and Rin both like it rough.

He fucks Rin hard, pulling Rin's hips against his own with the slap of skin on skin, and Rin's moans aren't muffled very well anymore and Seijuurou's starting to let out his own. Seijuurou is pretty sure that whoever lives next to Rin is getting sick of this, but he really doesn't care.

Rin's body jerks and shudders with every rough thrust, even with Seijuurou's hands on his hips holding him steady, and noises that can only be described as yips are making their way out of him.

Just as he can tell that Rin is about to come, Seijuurou pulls out of him and leaves his cock just barely touching Rin's hole, and a muffled scream comes from Rin's gagged mouth. Seijuurou loosens the tie and slips it over Rin's head.

"Beg for it."

"Seijuurou, fuck me, please let me come," Rin breathes, not even red anymore, not even embarrassed, just wanting.

Seijuurou leans over to whisper in Rin's ear.

"You want me to fuck your ass until you come?"

"Yes."

In one smooth motion, Seijuurou thrusts back into Rin, and Rin screams, and it's only another couple of minutes before Rin comes. He would collapse on the bed if Seijuurou wasn't holding up his hips and still in him. Seijuurou slows down a bit, knowing how sensitive Rin is, especially now. Just a few more thrusts and Seijuurou comes deep inside Rin, who moans and shivers, panting. Seijuurou pulls out and lets Rin flop on the bed before collapsing next to him.

Eventually, Rin starts breathing normally and turns his head to look at Seijuurou.

"Do you mind?" he asks, and there's insolence back in his voice.

"Do I mind what?"

"Undoing the belt."

"Oh."

"Idiot," Rin mutters as Seijuurou loosens the belt and removes it from Rin's wrists.

And then Rin might sit up and punch Seijuurou in the gut.

"Asshole! What the hell was that for?"

"I do not beg," Rin hisses.

"I'm pretty sure you do," Seijuurou laughs, and then he has to dodge another fist aimed at his face. He shoves Rin down, pins his wrists above his head, and glares at him. "Can you not? I will put that belt back on, loop it through the ladder, and leave you here for Nitori to find."

Rin struggles for a minute, his face set in a snarl, but Seijuurou is stronger than he is out of the water.

"Let me go," he says.

"Are you going to hit me again?"

"No."

And he doesn't this time. But Seijuurou has failed yet again at fucking the attitude out of Rin Matsuoka. He has started to doubt that that's going to happen.

But damn, is it fun to try.

End

May be continued, depending on reception.