If anybody knows Leo well enough, you'd know he's very prideful. Having to take the leadership role, he'd take the "My Word Is Law" shit a little too seriously and end up disregarding his bae's opinion in an argument. If things get a little too heated, it's likely that the bae will storm off, calling him a couple lovely curse words & recommendations to where he can stick his katanas. It's messy, and Leader Boy will feel like it ain't his responsibility to clean it up. He'll "know" that he's right, will think she's being a little overdramatic, and that she just needs to cool down.
First two days he doesn't contact her, knowing full well that she'll come back once she "returns to her senses." Note this is all from experience with fighting with his brothers, his family, so that's where his reasoning comes from. Family will always be there in the end, but she doesn't necessarily have to deal with his shit like his family does. And lord, once he realizes that days have passed by and she hasn't spoken to him yet, that's when things go a little wonky. He'll get these self-doubts, but not enough to make him want to apologize, that ass.
He'll head over to her apartment to confront her, asking if she really wants to end this relationship on what he considers a "stupid fight." Things do escalate, and it's not until she's shedding tears that he stops himself. He takes a reality check, just calming himself down and realizing just what exactly is he doing? He's made his girl cry, and for what? He doesn't want her to cry, not because of him. He still doesn't apologize though, not yet, but he does go up to console her, pulling her into his arms & wiping her tears away (She's either pushing him away or letting him do it, whatever preference ya got). He'll understand that he hadn't really taken in her opinion on what was supposed to be a relationship matter, and when she tells him just how bad he made her feel, Leader Boy is gonna feel that shame and guilt hit him like a ton of bricks. They're gonna talk it out like they should've done the first time and there won't be any total make up sex by then.
Its a few days later when the sex happens, and its to ease the rest of the tension in their relationship. He'll leave sweet kisses all over her torso and face, and will go slow but firm. He won't tease, won't pin her down, he'll only be focusing on what she'd want. And when she says "Leo, baby..." in that special voice of hers, he'll have her in a sweaty mess in a heartbeat. Aftercare leaves in a lot of kisses, holding, and nuzzles, with "I love you" being spoken between them, In the end of it all, their relationship significantly strengthens from the ordeal.
Raph and his bae will both most likely be stubborn and hot-headed, spitting fire at each other during a very particular bad argument, and once she leaves he'll head over to his gym & pound his punching bag into a raggedy mess, all the while grumbling to himself. But, I also think that Raphael would most likely get back with bae within a day of the fight.
Sure, at first he's gonna gripe and growl, saying some shit like if she can't handle him at his worst then she don't deserve his ass anyway, but the difference with Raph is that, amongst his family he's known to blow a gasket & brawl with Leo. He can do it as much as he can, and what're they gonna do? They're still there at the end of the day, supporting & being there for each other. But the bae isn't family, so there's nothing stopping her from dropping his giant turtle ass and moving on. That's why I think he'll be the one to go and patch things up. Once alone, he and she will have a heart to heart, where she'll see the big cuddly teddy bear admit he fucked up, and that he never wanted her to feel that he's against her. She's gonna apologize too, because at the end of the day they still love each other and they aren't gonna let their stubborn asses get in the way of that.
And yes, it does end up in make-up sex, because sweet-and-appreciative Raphael is a very sexy Raphael in bae's eyes (or in my eyes at least >.>). Sex's gonna be fast, firm, but not too rough. He's gonna have her bouncing on him and screaming to the neighbors just how much she loves him. Aftercare is some sweet pillow talk and his huge lovable ass cuddling her till they doze off.
To those who'd think Donnie would be the guy who'd beg on his knees to get his bae back from an argument, you're not that far off. But you ain't on point either. Yeah, he'd be begging to have her back eventually, but not during t he first few days of the argument. Don-a-tello is a fucking know-it-all. He's said to have more brains than heart, and damn it, he's nearly as bad as Leo when it comes to fixing arguments. He's the type to avoid confrontation, more likely to just ignore it all and resort back to normal, as if nothing happened.
But the flaw in that is, he himself won't let it slide. Donnie is the total embodiment of passive-aggressive behavior, according to his brothers. He will throw shade like nobody's business, will more likely than not give her the silent treatment, or leave her brief, short messages. Donatello is 6′5" of pure salt when he's peeved. And when his bae comes up and confronts him about it, he'll act like he has no idea what she's talking about. Things'll escalate and he'll end up locking himself up in the lab if he hasn't already. He'll be pissy and antsy and stubborn as hell, but he won't budge.
It ain't long before he starts feeling lonely again. The nerd still has a heart, and he does still love his bae. He starts to recall the argument for the first time in days, and thinks it over in a clearer state of mind. He'd figure out that both acted out irrationally, and on the way out of his lab he'll see his bae standing there holding apology sweets and whats most likely his favorite coffee. He wastes no time pulling her in to the lab, pulling her into his arms and rambling off apologies. To which she responds with apologies of her own, kissing his face and lips reassuringly. They do end up talking it out, this time with no jumps to conclusions.
Make-up sex does happen, and he has her laying on his work table, eating her out like he's been starving, and he'll be the one telling her just how much he loves her when he's tearing that pussy up.
Mikey has grown up around his brothers fighting. He sees the damage it can cause and knowing that, avoids it when he can. But when the inevitable happens and they do fight, Mikey's ready to be the peacemaker almost immediately. He wouldn't let her storm off, and would want to talk things out with her. But Angelcakes is pissed beyond relief, and he has to let her go, figuring that space would be best between them.He won't be happy about it, feeling guilty and ashamed at himself, but he'd know he'd be the one to make up for it all.
He has no shame whatsoever in begging, he just hopes it won't have to come to that. So later that day he'll come over to her place with pizza, a few snacks stolen from Leo's secret stash, and his ever famous puppy dog eyes, and she'll take him in. They'll snuggle and talk and watch some stupid movie to make things comfortable, and they'll move on.
Bae knows that Mikey's heart's in the right place, and that he won't shy away from telling her just how much he loves and appreciates her. To which he does, over and over when she rides him like a bull during the makeup sex. He hadn't really intended on sleeping with her that night, but she'd been the one to initiate it, and he wouldn't be the one complaining. They're both breathless and snuggly at the end of the night, and make-up sex phase will last a few more days, because Mikey still wants to show his Babygirl just how much he appreciates her. For just a few more days.

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DT Ninja Turtle Headcanons
Romance(18+) Just a work where I can publish all the ask answers I got on my blog. Chapters will pertain to different asks, and can range from long paragraphs to short answers. Turts are 2014/2016 renditions and are over 18+.