Chapter Text
Madara walked through the forest that bordered the Senju and Uchiha territories. It was neutral territory, and he needed somewhere quiet to think. There had been a battle between the two clans about a week ago, and Hashirama had once again asked for peace. He had thought about agreeing, but he had to take his clan’s opinion into account. There were not many people in their two clans that actually wanted peace; the hatred between their clans was too strong.
He needed a way to bring their clans together. His people needed to want to get along with the Senju, and vice versa, or the fighting would start up again. What could he do to convince them to get along?
He stopped walking when he caught the scent of an omega beginning their heat cycle. What would an omega be doing all the way out here in such a state? He decided to investigate and followed the scent until he came across a clearing in the forest. His eyes widened in surprise at who he found.
Tobirama Senju was sitting under the shade of a tree with several scrolls scattered around him. He had a scroll in hand and seemed to be taking notes. Every once in a while, he would form the hand signs to an unfamiliar jutsu. Judging by the cursing that followed, whatever he was trying to do wasn’t working.
Madara knew he should probably leave, but he found himself overwhelmed by curiosity. Why was the heat scent coming from Tobirama? He had been certain that the other man was an alpha, like him. And what jutsu was the Senju trying to create now? He hated to admit it, but Tobirama had a tendency to come up with rather useful jutsus, such as the Shadow Clone jutsu and all those water ninjutsu. Although the latter wasn’t useful to him as he had a fire affinity.
Deciding to make his presence known, Madara steps into the clearing. The younger man looks up from his scroll and seems surprised to see him. Madara had heard that omegas had trouble sensing others when they were in heat. Normally, Tobirama would have been able to sense him from a mile away.
The two stare at each other for a minute before Madara states, “I was unaware that you were an omega.”
Tobirama scowls at Madara, expression wary. He was in no condition to be fighting right now. His temperature had increased steadily since he went into heat, and he was having trouble concentrating. Perhaps if he answered Madara’s questions, he could get out of this situation without fighting.
“That’s because I wasn’t an omega. I’ve been working on a jutsu that would allow someone to switch between being an omega and alpha. It’s more practical to send alphas into battle. They don’t have to worry about going into heat or being captured by enemies for…..breeding purposes. It would also allow betas and alphas to become omegas to have children. All this fighting has reduced the Senju’s population,” says Tobirama.
“And you decided to test this jutsu on yourself?” asks Madara, baffled.
Tobirama gives him a flat stare. “And who else should I have tested it on? No one in the Senju clan would agree to be a test subject, and Hashirama isn’t about to let me use our enemies as test subjects.”
“He’s still as soft hearted as ever then?” asks Madara.
A gust of wind blows through the clearing, bringing Tobirama’s scent to him. The smell has gotten stronger since he first came here. He examines the other man curiously. There is a light sheen of sweat on Tobirama’s skin and he seems slightly out of breath. Madara looks down and sees that the other man is half hard. It won’t be long now before the heat makes it impossible for Tobirama to think about anything but sex.
“How soon after your transformation did you go into heat?” asks Madara.
“About an hour. I’ve been trying to modify the jutsu I used to transform, but nothing has worked; and it’s been getting more difficult to concentrate,” says Tobirama.
Madara steps closer to Tobirama, drawn to his scent. The lust in his eyes brings a blush to Tobirama’s face. “Do you know how complete your jutsu was? Are you completely an omega or somewhere in between?” asks Madara.
Tobirama looks puzzled, not entirely sure what Madara is asking. “It certainly feels like I’m completely an omega. I don’t yet have any way of knowing whether I have a uterus, though.”
“And what about your knot? Has it disappeared?” asks Madara.
Tobirama looks down at his lap, startled, before glancing back up at the Uchiha. “I hadn’t thought to check,” he admits.
Madara gives him an expectant look. “You want me to check now?” he asks, surprised.
Madara shrugs. “Why not?”
For a moment, Tobirama considers telling him no. But, he’s a realist. He knows how unlikely it is that he’ll be able to transform back anytime soon. He’s already started to crave sex, and it won’t take more than a day or two before he’ll be willing to jump the nearest alpha. He needs to choose a heat partner while he’s still capable of thinking rationally. He knows that Madara is the enemy, but the man doesn’t actually seem that violent off the battle field.
Tobirama leans back against the tree, lifts his hips up, and slides his pants down to free his erection. Although it feels embarrassing to expose himself like this, the lust on the other man’s face is gratifying.
His breath hitched as he wraps his fingers around the base of his cock, rubbing his thumb against where his knot used to be. His jutsu had worked. He glances at Madara through half-lidded eyes and sees the other man watching him hungrily.
His eyes fall shut as he begins to stroke himself. He bites his lip to hold back a moan. He rubs his thumb against the tip of his cock, noticing that he’s started to leak precum. And that’s not the only place he’s leaking, he realizes in surprise. He uses his unoccupied hand to reach behind to feel his entrance. His fingers come back wet. He holds his hand in front of his face, rubbing his fingers together. The slick has the same texture as lube. How odd.
He looks up to see Madara watching him intently, and has to look away quickly, embarrassed. He hears footsteps approaching him, and is surprised when Madara kneels down next to him.
Madara runs his fingers through Tobirama’s hair and leans forwards to press their mouths together. He gently bites Tobirama’s lower lip, causing the younger man to gasp. He uses this opportunity to slide his tongue into the other man’s mouth. Their tongues slide together, causing them both to moan.
Madara pulls away from the kiss and turns his attention to Tobirama’s neck. The younger man’s breath hitches when he begins to lick and nip at his skin. One of his harder bites causes Tobirama’s hips to arch towards him. He removes Tobirama’s shirt and spends a moment admiring the other’s form. He runs fingers over taut muscles, lingering at the areas that get a positive reaction from the other man. He found out that the man’s nipples were particularly sensitive, biting one earned him a breathy moan.
Throughout it all, Tobirama’s scent had been getting more intoxicating, steadily increasing Madara’s arousal. He could feel himself going into rut. He places his hand on the back of Tobirama’s neck and then slowly slides his fingers down the other man’s back, causing the younger man to shiver. As he rubs his fingers against the other’s entrance, teasingly, Tobirama leans closer to him. Tobirama rests his head on Madara’s shoulder and wraps his arms around the other man.
“Nervous?” asks Madara.
“…..a little…..”
Tobirama begins to hear a purr like noise coming from Madara. Both alphas and omegas could make this noise, betas could not. An alpha’s purr was known to be soothing to omegas and an omega’s purr could calm their alpha. He was mildly surprised to realize that it was working; he could feel his tense muscles relaxing and some of the anxiousness went away.
Madara’s fingers were still rubbing against him, and he began to feel impatient. Perhaps Madara noticed his frustration, because one of the fingers began to enter him. It was an odd sensation, but there was no pain. He hummed in pleasure when another finger was added.
Madara took his time stretching Tobirama; and he decided the younger man was ready for him when Tobirama started pressing back against his fingers. The other man let out a soft whimper when he removed his fingers.
“I need to get undressed,” says Madara.
Tobirama reluctantly pulls back from him; and while Madara gets undressed, Tobirama removes his shoes and slides his pants all the way off. Once all their clothes are off, Tobirama crawls into Madara’s lap and slowly sinks down onto Madara’s cock, causing them both to moan.
Tobirama sets a fast pace, lifting himself up until only the head of Madara’s cock is left inside him before slamming himself back down. He’s too far into his heat to take things slow. Madara has a tight grip on his hips, while Tobirama has one hand on Madara’s shoulder and the other carded through his hair.
Tobirama feels like he’s on fire, and every thrust inside him fans the flames. He’s given up on trying to be quiet now. Every hit to his prostrate drags a moan or whimper out of him. The feeling of teeth on his neck, piercing his skin, finally pushes him over of the edge. He cries out as the pleasure overwhelms him.
Madara tastes blood in his mouth; the sounds coming from Tobirama and the tight heat around his cock rips his orgasm from him. He holds Tobirama’s hips tight, keeping the omega on his cock as his knot swells. His seed fills the omega, claiming him, breeding him. He lets out a groan at the thought of the omega’s stomach swollen with his child.
‘Mine,’ he thinks possessively.
They sit in silence for the next few minutes, each trying to get their breath back. Madara’s knot will keep them locked together for the next fifteen minutes. Tobirama shifts just slightly, feeling the knot stuck inside him and enjoying the feeling of being claimed. Which is kind of an odd thought to have for a former alpha. He hadn’t been raised to think of such things. Were the instincts of an omega that strong or was he simply discovering a previously unknown kink of his?
Tobirama feels fingers running through his hair, and Madara’s other hand is running over his back. Although initially startled, he soon relaxes and even begins to purr. ‘Even that noise is different now,’ thinks Tobirama, amused. He’s sure that the difference in sound would hardly be noticeable to someone else, but he knows himself well enough to tell the difference.
He sees Madara reach for his pants and pull out a storage scroll. The other man unseals a water canteen, drinks from it, and then gives it to him. He thanks the other man before taking several gulps of water. He hadn’t realized how thirsty he was until now.
The silence between them is starting to feel awkward. What do you say to someone from an enemy clan that you’ve just had sex with? Eventually, Madara’s knot un-swells and he’s able to get up from his lap. He grimaces when he feels Madara’s seed run down his thighs. He can feel Madara watching him as he gets out his own storage scroll and gets out the supplies he needs. Water, food, and a wash cloth to clean up.
He puts his pants back on, noticing Madara do the same next to him, but he doesn’t bother with the underwear or his shirt. It isn’t cold out, and he’s only going to have to get undressed again in a few hours anyway when the heat hits again. He knows that omegas in heat crave sex every three hours for three to seven days.
He gathers up his scrolls and begins to look through his notes. He doesn’t have to worry about Madara leaving before his heat is over, as he had smelt the alpha go into rut. As he’s the omega who trigged Madara’s rut, the other man will crave sex whenever he does until his heat is over. It’s how their weird biology works.
After a few minutes of reading, Madara comes over and starts to look at the papers he’s not holding. Tobirama decides not to protest. None of his notes contain anything truly secret, and sometimes it takes an outside perspective to figure out what went wrong.
They don’t get much done that day, but Tobirama does find out that Madara knows the theory behind jutsu creation. He considers it a pleasant surprise that his heat partner is able to keep up with his intellect.
In between having sex, Madara familiarizes himself with Tobirama’s work. They discuss what he’s tried and why it might have failed. Tomorrow, they’ll try out some of their new theories; but for now it’s late and they need sleep. They both unseal their own sleeping bag and lay down next to each other. With any luck, Tobirama’s heat will let him sleep through the night so he can be well rested for tomorrow. Most omegas are able to ignore their heat while they’re asleep, but some have heats that are strong enough to wake them up in the middle of the night. The two of them wish each other good night before falling asleep.