Chapter Text
The medical examination table is cold under Sasuke’s bare ass.
Two brief knocks on the door announce Tsunade's arrival, a moment before she enters the room, clipboard in hand. “Good morning, Sasuke,” she says, without looking up.
“Morning,” he mumbles in reply.
She sets the clipboard on the nearby desk, and offers him a professional smile. “Your bloodwork came back, and all of your numbers look good. Today, I need to take a look at your reproductive organs, and make sure there won’t be any complications there.“ She pats the table behind him. “On your knees, please.”
Straight to business, then.
Facing foes in battle is much easier than sticking his bare ass in the air. From the corner of his eye, he watches Tsunade spread lube on a metal probe and then set the device on a paper tray. “Allright,” she says, once he’s in position, after having covered himself as best he can with the inadequate paper gown. She immediately pulls the gown aside. “How much do you know about the breeding process, Sasuke?”
“Umm. A bit,” he lies, flinching slightly from her chilly touch when she rests a hand on his hip. He’s been researching mating and pregnancy for months, ever since he suspected he was beginning to present as an omega shortly after his eighteenth birthday. His blood test a month ago had confirmed as much.
“Ok. I’ll talk a about it some as we go. For the exam, I’m just feeling for any abnormalities. You let me know if anything feels painful, ok?” He nods, and she begins. Experienced fingers prod and explore his testicles first. She rolls them in her hands, pressuring slightly, ensuring there are no physical faults. She talks as she continues to examine his exterior parts. “I imagine you know, then, that healthy omegas are extremely important to the future of the village. You’re certainly not required to carry a child, but if you choose to willingly do so, you would be doing the leaf a great service.”
Those able to bear children are increasingly rare, and it is seen as an honor to do so, especially if the parent also happens to be a skilled shinobi.
“Yes, ma’am.” He’s already made the decision, and she knows it. It’s a little annoying that she chooses to reiterate what’s obvious.
Her hands move on, pressing gently along his taint, tracing and inspecting the internal biology with her fingertips as she moves down. At the end of her path, she grasps his flaccid cock in one hand. The pressure of her grasp makes a smooth, exploratory pass up and then back down the length of his dick.
She feels here and there, inspecting him like a piece of meat to be purchased. “Everything looks good externally,” she declares. “Let’s have a check with the internals, hmm?” She collects a small glob of lube in her palm, and smears it along her gloved index finger.
Sasuke swallows. One of Tsunade’s hands rests on his hip. He cannot help his clench when a blunt presence pressures at the center of his anus. Taunade is unhurried and gentle, as she pushes her well-lubed digit a little more insistently, pressing beyond the tight ring of muscle and successfully inserting her finger into his body. The intrusion is foreign, and bizarre. It’s not painful, but, especially under the circumstances, it feels violating in a way that requires him to take a steadying breath.
He clenches tighter, against his will, when she attempts to add a second slender finger alongside the first.
“I know it’s an odd sensation…Just try to relax,” she tells him, as though she’s not breaching his most sensitive orifice for the first time.
Sasuke frowns, and says nothing.
“Have you been sexually active before?”
“No.”
“Have you ever explored your copulatory opening, masturbated with it, or anything like that?”
He knows the question is purely medical, but his face still heats a bit. “N-no, ma’am. Not really.” It is basic human anatomy to have a generic understanding of the reproductive organs in everyone’s body, but he’s only ever masturbated with his hand on his dick before, and he only presented as an omega less than a year ago. He’s not exactly had much down-time, after the war, settling back into Konoha, and all that.
“That’s ok. Many male-presenting omegas haven’t.” She speaks with her fingers still inside of his ass. He’s reluctantly becoming used to their presence. “Let me show you the sensations of these things, to better prepare you for being bred.”
Sasuke nods, willing his body to relax. It ignores him.
“This pressure here…” She presses downward from inside of his ass, like she’s hooking her finger toward the root of his dick. The sensation of it is novel, and surprisingly not-unpleasant. “This is the anal side of your prostate. Most people with a prostate can achieve climax by massaging here.” To reference her words, she gives the area a few delicate, stroking presses. Sasuke sucks his lips between his teeth.
A moment later, Tsunade’s fingers smoothly recede out of his ass. Sasuke glances out the corner of his eye, and sees her remove her medical glove.
Tsunade dons a clean glove, and explains her action. “Even though a male omega’s copulatory opening is inside the anal entrance, and is a self-cleaning system much like a vagina, you should avoid potential fecal contamination, as much as possible. You shouldn’t engage in anal sex, and then in copulatory sex, without a condom change.” She spreads fresh lubricant on her clean glove. “If your partner isn’t wearing a condom, I recommend avoiding copulatory sex altogether, unless your intention is to become pregnant.”
“Understood,” he replies distractedly, as her hands return to his bare skin.
Her finger returns to his ass, but instead of inserting straight into him as she had last time, she angles downward, into the channel that diverts just inside his anus. “Your copulatory opening is here…” The alternate path is well-sealed by a flap of skin and cartilage that functions much like an epiglottis allows food to be swallowed to the stomach, not inhaled into the lungs. She prods gently, until her finger slips into a space that feels different than the anal intrusion had felt.
Sasuke feels himself flutter around her finger, like his body is unsure how to react. She slides deeper, adding a second finger. “And this…” She puts pressure upward. “This is the other side of your prostate.”
Because of the circumstances, Sasuke wouldn’t claim the sensation is pleasurable, exactly. But it is markedly different, in a way that makes his legs tremble a bit against his will, as Tsunade slides her finger back and forth over the area.
“Are you ok with me testing your arousal response?”
He’s not exactly sure what that means, but he can deduce it well enough. “Sure, that’s fine.”
Her fingers press a little harder, making little sliding motions inside of him. They already slide more easily than they had inside of his ass, and the longer she strokes him, the more intense and yet numb the feeling is. With no small measure of embarrassment, he realizes his eyes have lidded, and his hips are humping a bit with the rhythm of her fingers.
Untouched, his cock begins to harden where it hangs between his legs.
“Excellent,” she says. “That’s the ideal response.” When she removes her fingers, he feels a gush of fluid leak out with them, dribbling down his taint and balls. In the background, he can hear her wiping some of the excess from her gloves.
The occasional presence of the slick had been the telltale sign that he was an omega. It becomes significant worse when he’s in heat.
“I’m going to insert a speculum, so I can take a look at your uterus.” She grasps the metal instrument from the nearby table. “You’ll feel a little bit of pressure, ok?”
Sasuke nods. This whole ordeal feels very much like he’s an animal being inspected for breeding soundness. He supposes, with a hidden frown, that that’s exactly what this is.
The metal is colder than her fingers had been. The pressure edges on painful but it isn’t overwhelming. She spends only a few moments there, evaluating him. She inserts a couple of smaller instruments, evaluating the inner walls of his uterus.
“It all looks good,” she reports as the metal withdraws, accompanied by more of his own fluid, mixed with the lubricant. She gives his hip a pat. “You can go ahead and sit comfortably.”
She waits until he is seated and finished attempting illogically to get the useless gown thing into place again before she speaks again. “If your cycles have been regular, your heat should coincide with Naruto’s rut perfectly. Kakashi will be there to assist you both through all of the breeding process.”
Hiding his frown, Sasuke asked, “Do you really think we’ll need him? I’m sure we can figure it out, just the two of us.”
Her smile is patient, if not a bit wearied by his inexperience. “As this will be an arranged mating, and not the naturally-developing progression of a relationship, you will definitely want a third party there to assist, just in case. As a beta, Kakashi will be able to remain wholly neutral the whole time.”
Sasuke shifts in his seat. He’s heard stories, of course. Shitty alphas could get pushy. He'd never been concerned about it, since there is virtually no one who could out-power him in a fight, alpha or otherwise. That aside though, surely Naruto wouldn’t be like that. Naruto is one of the most nauseatingly considerate people on earth. They are friends, after all.
He realizes Tsunade is waiting for an acknowledgement, so he nods distractedly.
“I trust that you learned in school about the mating process itself, and how it differs from recreational sex?”
“Yes.”
“And do you understand the pregnancy process, your rights and responsibilities as a volunteer surrogate?”
“Yes.”
Tsunade eyes him for a moment. It feels weighted, like she’s trying to read his mind. She folds her arms, and asks, “Why are you doing this for Naruto?”
It’s a fair question. Still, he hadn’t expected it, and has to figure out how to articulate the many things in his head. He decides a simple answer is the best. The deeper reasons aren’t really Tsunade’s business anyway. “I’m not doing it only for Naruto. He and I both want children, and neither of us has a mate. You and the other doctors say we’re compatible physically, and I think we’ll provide a good upbringing for a child.” He shrugs. “That’s what it comes down to.”
She considers him with her usual, quiet appraisal and half-sour expression. He has no idea what her inner thoughts are, and he doesn’t really care.
“Mm.” She hums a noncommittal sound. “Very well.” She stands up from her rolling examination stool. “You appear to be in perfect physical condition for reproduction. When your heat cycle very first begins, seek Kakashi out, and he will guide you through the rest. Ok?”
“Understood. Thank you, Tsunade-sama.”