This is meant as Asmodeus x Iruma, but can be interpreted as Asmodeus x Iruma x Clara if that is what you prefer. Chronologically, this takes place before their second year's Battler party. Mild spoilers for the manga.
The first time Iruma had sex with Azz-kun, it was completely unplanned.
They had been doing training together, trying to refine the way they could use Azz-kun's fire and Iruma's arrows together more effectively. They had used them together instinctively during that entire mess at the Deviculum to very little effect, but Iruma was convinced if they refined the technique they could turn them into a seriously powerful combined weapon.
They'd asked for permission to use the school's open training grounds - to minimize damage to surrounding structures - and, since they planned to stay practicing all day long, to let them spend the night at Royal One's nap room. An unfortunate consequence of planning to use such devastating levels of power was that Clara couldn't be involved in their training until they could be sure that they could control it and no harm would come to her. Some bribery may or may not have been involved in convincing her to stay behind.
They'd practiced and practiced to exhaustion, and finally decided to call it a night when they felt they were at risk of making too many mistakes. There were only minor things that weren't going smoothly, but the level of coordination needed meant that any mistake could turn seriously dangerous, seriously fast.
After cleaning up, eating a hearty dinner and heading to bed, Iruma found himself too keyed up to go to sleep. He was physically exhausted, but he kept going over and over the dangers they were facing in his mind, so he stayed up, sitting in the same bed as Azz-kun, talking about it, both of them already in their pajamas but in no hurry to actually get to sleep. There was much that Azz-kun didn't know, much Iruma couldn't tell him, but even with these gaps in his knowledge, Azz-kun had very interesting insights in this matter. It definitely helped that Azz-kun had grown up around the most influential demon families and could bring his intricate knowledge of the ways of the demon high society into it.
As they were talking, the topic of the future came up. Iruma still wasn't entirely clear what he wanted for himself, only nebulous fantastic ideas of maybe becoming the demon king and building a better future for everyone. It all felt very unreal to him. On the other hand, Azz-kun was laser-sharp focused on what he wanted, as usual. He described with passion and clarity how he would always be by Iruma's side, always work to help him achieve his ambitions, challenge himself so he wouldn't lag behind or turn into a burden for him.
That gave Iruma pause. What about Azz-kun's own ambitions and goals? If he spent every moment by Iruma's side, when would Azz have time to build a life for himself? What about a family? Wouldn't he want to find someone to support him in turn, to build something with?
Iruma asked Azz-kun that. To Iruma's surprise, all of Azz-kun's eloquence and verbosity failed him. He went red as a tomato, looked away and mumbled something about not needing anything like that.
Iruma could be a little slow sometimes. Since he had spent the first fourteen years of his life being emotionally neglected, he had a hard time understanding when he was genuinely cared about and loved. A part of him still believed, deep down, that everyone was only with him because they wanted something from him. But here Azz-kun was, more than a year later, and the only things he had asked of Iruma were being by his side and being allowed to be part of Iruma's dream. All of a sudden, a thousand single moments fit together in Iruma's mind like puzzle pieces to make a cohesive whole. Azz-kun's looks of adoration, his protectiveness, his jealousy, his proclamations, his laughter and joy, his companionship...
"Azz-kun, how long have you been in love with me?"
Iruma won't ever know how he got the courage to ask that. Perhaps it was the near-darkness of the room they were in, giving everything a bit of a surreal yet intimate feel. Perhaps it was just the surprise of the realization that made him blurt that out. Perhaps it was just because he found that epiphany resonating with something inside him that he hadn't realized had been growing for a long time.
Azz-kun froze. Wouldn't look at Iruma and got even redder in the face, if it was possible, to the point where Iruma worried for a moment if he wouldn't accidentally set fire to the bed they were sitting on. Then finally, after taking a deep breath, he answered.
"Probably since the very beginning."
Iruma had definitely been very oblivious indeed. He ruminated on Azz-kun's answer for a moment, balancing against the feelings he could feel scuffing a nervous toe in his own heart, and made a decision.
"I see. Azz-kun, can you look at me?"
It took a moment, but there was no request from Iruma that Azz-kun would refuse. He raised his eyes and looked at him. Even in the dim light of the lamp they had left on, his eyes under those otherworldly pink lashes looked vulnerable and hopeful, like Iruma had the power to make his world or destroy it with a single word.
It was a level of trust and openness that deserved to be reciprocated.
"I'm glad to hear it, because I'm pretty sure I'm in love with you, too. I'm sorry it took me so long to catch up to you."
Seeing the joy lit up Azz'kuns face was like seeing the sun come out from the clouds after a dark, stormy day.
Their first kiss was a clumsy, messy, giggly affair. No tongue, because Iruma was extremely aware of the sharpness of Azz-kun's teeth, and it took some time to figure out how to avoid their noses bumping into each other and how to remember to keep breathing.
If anyone had asked Iruma how his first kiss would go, he would never have guessed that there would be quite that many fits of giggling, on the side or either him or his kissing partner.
But Iruma didn't care about any of that. Azz-kun's lips were soft, his face was still flushed, his hands alternated between roaming Iruma's arms, the ends of his hair, the back of his neck. Azz-kun's hair, in turn, felt like the softest thing Iruma had ever touched, and his skin through his pajamas felt hot and inviting.
Iruma wanted more of it.
Before he knew what he was doing, he had pushed Azz-kun to lie back on the bed and Iruma had climbed on top of him. Feeling that heat all over his body was quickly becoming one of Iruma's favorite sensations.
All Iruma knew was that kisses were great, Azz-kun's body heat felt amazing, and Azz-kun kept making this tiny gasping, mewling sounds that were making something primal and possessive wake up in him.
He wanted more of it. All of it.
That was when they shifted positions, their hips lining up, and Iruma became sharply aware of two very immediate facts: one, they were both very, very male, and two: they were both very, very happy about the way things were going.
Iruma had, at this point, been living in the demon realm for more than a year. Some of their core beliefs had, by this point, started to rub off on him. One of them was that going after what you want with sheer abandon was not something shameful, but rather something praiseworthy.
So he let his instincts take over and ground down. This course of action seemed to be met with Azz-kun's enthusiastic approval, because he, in turn, ground up to meet Iruma. Things got... a little fuzzy after that.
Iruma would later recall bits and pieces of what followed with a mixture of fondness and awe at his own daring. At some point, one of them, or maybe both of them, had opened their pajama bottoms because he could recall the sheer, toe-curling pleasure of skin against searingly hot skin. Hands got involved. It all mixed up in his memories with the mindless terms of endearment and devotion that Azz-kun was whispering to him in between kisses as if chanting, and the ones he was whispering in return.
It was all over entirely too quickly. It was too intense for it to go any other way.
After, he would take a moment to feel mortified at how bold he had been, but he hadn't really been thinking at the time, so there was no time for his shyness and insecurity to take over. For a moment, he had felt like he had every right to go after what he wanted, as if he had been under the influence of his imitation evil cycle, only entirely of his own volition and for something far more important than getting a better classroom or winning a devidol's competition.
But right at the moment, all he could feel was warmth, satisfaction, a deep contentment... and a rapidly cooling sticky spot that he really should do something about.
He grimaced, and, saying a silent thanks for the spell of keeping that would instantly clean and tidy up everything after they left the bed, wiped Azz-kun and himself clean with a corner of the sheets.
Azz-kun hadn't reacted to being cleaned, or having his pajama bottoms adjusted afterwards. His breathing was ragged, the heels of his palms digging into his eyes.
"Azz-kun? Are you alright?"
To Iruma's horror, Azz-kun's ragged breathing resolved itself into a sob.
Before Iruma could panic and apologize a thousand times for somehow misinterpreting the situation and taking it too far, Azz-kun launched himself at Iruma and hugged him across his waist, digging his face into Iruma's not-fat-just-soft belly.
"I'm so happy! I never thought…! I never imagined…! I don't deserve…!"
A huge wave of relief washed through Iruma at those words, and he spent not a small amount of time petting Azz-kun's hair and cooing reassurances at him. Yes, Iruma was happy too. No, it wasn't a dream. Yes, Azz-kun deserved anything good coming to him. No, Iruma wasn't going to think less of Azz-kun for wanting this; after all, Iruma wanted it too.
After a while, Azz-kun managed to calm himself down and sat back up, letting his hands linger on Iruma's waist. The look on Azz-kun's face as he looked back at Iruma left very little to the imagination as to how he wanted the rest of the night to go. Sleeping seemed to be waaaaay down in the list of priorities, exhaustion from a long afternoon of training be damned.
But that gave Iruma pause.
He had told Azz-kun and Clara that he would one day tell them his secret. The thought of telling them, of baring his vulnerabilities to their scrutiny had been an overwhelming burden in his mind. He still couldn't forget the hallucinations he had seen during the harvest festival. It had broken his heart to see and hear his best friends' rejection of his humanity. It had reassured him when they had told him that they would wait for him, and he knew, objectively knew, that if there were any two demons who could accept him for who he was, his two best friends, his soulmates, would be them. But deep down, he was still afraid.
The night's events changed things, though. It was one thing to hide something so important from a friend, but it was another thing altogether to hide it from a lover.
So when Azz-kun leaned forward to claim another kiss, Iruma stopped him, held him at a distance with his hands on Azz-kun's shoulders.
"Wait, Azz-kun, I…"
He stopped. He took his hands off Azz-kun's shoulders. He grabbed the fabric of his pajama bottoms tightly in both hands instead. Already missing the warmth of Azz-kun's hands on his waist, he swallowed, fidgeted, started again.
"Azz-kun, I think I am ready to tell you my secret. It's… it's probably best to do it before we do any more."
But try as he might, Iruma couldn't find the words to tell him, so he decided it would be easier to just show him. He wiggled a bit back on the bed and took off his pajama top, and after a moment of hesitation and belated self-consciousness, his bottoms and underwear as well, and turned his back to Azz-kun, quivering with trepidation.
It was possibly the hardest thing he'd done in his life.
He felt a gasp behind him, and couldn't help but flinch when a trembling hand touched, very delicately, the spot on his back where wing roots would be, then travelled softly down to the base of his spine, where a tail would be sprouting, if he'd had one.
All demons had wings and tails. The exact shape and size varied wildly; some had scales, some had hair, some had feathers, some were tiny, some were so big as to turn cumbersome. But there weren't any demons that had neither.
Azz-kun's hand stayed there, a searing brand over the spot where Iruma's tail should be, for a long time. Iruma had his eyes screwed shut, so he couldn't see anything, and couldn't hear anything over the loud thumping of his own heart in his ears. Then he felt the bed dip as Azz-kun shifted, and a moment later he flinched again as Azz-kun's other hand touched Iruma's cheek in a movement so soft as to be a caress and exerted soft pressure so Iruma would turn his head and look back at Azz-kun.
He opened his eyes, dreading what he would see in Azz-kun's eyes.
Azz-kun's face was closed-off. His lips pressed tightly together, his brow furrowed.
Then, after apparently debating with himself for a long time, he spoke.
"Iruma-sama... are you a human?"
Iruma gulped, and finding himself still without words, nodded.
Azz-kun let out a long breath, his expression unreadable, and closed his eyes. Then slowly, he leaned forward and brought Iruma's head towards him, one hand still on the back of Iruma's waist, the other now on the back of Iruma's neck.
Their foreheads kissed.
"That explains a lot, and makes no sense at the same time. But I've always known you were special."
They stayed like that for a long moment, breathing each other's air, Iruma's heartbeat gradually slowing down.
Then Azz-kun spoke again in a low voice, still from the same position.
"It doesn't change my determination, or what I feel for you, Iruma-sama. I want to stay by your side, I want to support you and be your halberd. I want to share your joys and your sorrows, and shield you from your enemies."
Iruma's throat closed at those words. If he wasn't careful, it would be him turning into a sobbing mess.
"But if anyone even thinks to taste a single drop of your blood, I might just have to burn the whole world down, Iruma-sama."
Iruma couldn't help but chuckle a little wetly at that.
"Do you think, under the circumstances, that you could call me Iruma?"
"Iruma-sa… Iruma. Then perhaps... perhaps you could call me Alice."
"Ali… Alice."
They both giggled a little hysterically at that. Here they were, Iruma naked as the day he was born, Azz-kun still in his rumpled pajamas, having just been as close to each other as two beings can be, opening their hearts to each other, and saying each other's names without honorifics was what made them squirm and cringe in embarrassment.
Iruma dried his suspiciously wet eyes and chuckled again.
"Maybe we keep that for when we're alone together… for now."
Later, Azz-kun… Alice… would reciprocate Iruma's trust and whisper his own secret in the dark. Later, both of them would tell Clara as well, and receive her own confidence in kind - as well as a tantrum of epic proportions for going ahead and doing something special between them that Clara hadn't been involved in. It would begin an entire host of negotiations, of hurt feelings and reassurances, of finding out where they stood in their soulmate trio and fine-tuning their changing dynamics.
But that would be later. This was now, when Iruma had laid himself bare to one who held a part of his own heart, and had not been rejected nor demeaned for it. This was now, when Alice removed his own clothes to put himself at the same level as Iruma.
Seeing that expanse of flawless, smooth skin, offered willingly for his eyes alone, awakened something greedy inside Iruma. And if all that time in the demon realm had taught him something, it was that among demons, being greedy was not a vice, but rather a virtue.
The second time Iruma had sex with Alice, he was very much expecting it, and he went into it with intent and determination.
Remember reviews are love, and much appreciated!
A note on language: I kept all of the original honorifics, so I'm sorry for the confusion if you've only watched/read this work in a translation that didn't include them. This is mostly common knowledge by this point, but the most common honorifics are:
–sama: extreme respect
-san: respect
-sensei: teacher/professor
-kun: friendly towards a male
-chan: friendly towards a female or a child
lack of honorifics: extreme closeness.
All of these can be used insultingly when not suited to the actual relationship between characters. There is a second degree of closeness implied when characters refer to each other by their first names instead of their last names, with or without honorifics.