Every time Frederick tried to address the exalt or his bride formally, one of them was quick to silence him with a kiss, which may not have been the best way to condition him to call them by name, but they wanted to keep gentle with him. Frederick was more than just a servant; he was a dear friend, a lover, a frequent guest in the royal bed. Some both king and queen adored, who they wished they could be more public in their relationship with, but he seemed content with being their secret, wanting their happiness more than the recognition.
But his selflessness was frustrating to Robin and Chrom, as much as they adored it almost nightly. His eagerness to please was incredible, and his sexual prowess meant they were rarely left wanting, but that night, it was all about him, about repaying his adoration by focusing solely on him. A daunting task to be certain, given every instinct Frederick had made it difficult to accept being in the middle of his lovers, even with the loaded, loophole-heavy insistence that it was "what they wanted" pacifying him into accepting the position between them, the object of their dual and coordinated affections. They were going to make sure he was rewarded for his devotion and loveliness no matter how much they had to drag him along.
The knight sat in his king's lap, Chrom's cock buried deep inside of him, hands tightly gripping his hips and guiding Frederick's motions atop him. It was hardly unusual to be the one receiving Chrom's affections, but usually the lovely woman in their lives only sat to the side, watching keenly, perhaps touching herself as she awaited her turn with one of them. Often, the next round would involve Chrom inside of his wife, Frederlick on his knees between her parted legs, lapping at her folds and his shaft in unison. Other times, he would orally pleasure her as Chrom claimed him from behind, ensuring their simultaneous pleasuring. He was content with that, with making the two he loved more than anything in the world feel good. He knew he was more than a mere enhancement to their love lives, but playing a supporting role came naturally to him, felt 'right'.
But Robin had no intention of playing the role of passive observer or merely reaping the admittedly intense feeling of being eaten out by a man on the receiving end of her husband's cock. That would most certainly not have been an expression of how important Frederick was to her as well, accepted eagerly into his life as someone to adore and serve just as much as the king Frederick had known forever. Instead, the queen leaned against his muscular form, pressing kisses into his neck as her hand slowly stroked his cock, working to compliment the motions the knight himself made on Chrom's cock, the sharp and shrewd woman knowing just how to touch him in a way that certainly made being in the middle seem as desirable as he'd imagined.
"Mila-" he began, quicklly cut off again by Robin's lips against his, her bare breasts pressing into his chest, the kiss heavy and firm with insistence that he remember not to call her that.
"If I am to be called your anything," she whispered into his mouth, voice low and heavy with want and desire, and he had no earthly idea how she managed to woo him with a voice, but the mere sound of it sent shivers of arousal up his spine, "Then it had best be your 'love'." Her soft hand continued stroking along his impressive shaft, the tactician keen's senses of what her partner was feeling letting her adjust to what would best rile him up. "Chrom and I are blessed to have found a second person in our lives we adore as much as the one we married, and we want you to accept that you're not a secondary player in our lives."
"Yes, m'love," he said, voice quivering, but beneath it she could make out the odd inflection, the reflexive urge to say 'milady' he barely corrected the course of in time, but it nonetheless brought a smile to her soft lips. She planted another long, hungrily kiss to his lips, her body shifting downward as she pulled away, the knight knowing what she had in mind. It was a rare sight for the grown man to blush, but his cheeks couldn't help but gain a bit of pink as Chrom's thrusts into him picked up and Robin's lips pressed to his inner thigh, drifting inward and deeper as the knight's breath drew heavier. Her kisses trailed up along his shaft, lips parting to loose a rush of warm, moist breath along his swaying, twitching tip before she sank down, taking her lover into her mouth.
Frederick gasped, moans ragged as she began to suck him off in perfect time with Chrom's thrusts into him. Being in the middle was new for him, and a breathtaking experience, one that made him begin to lose control, bucking up into Robin's eager, wet mouth, coming back down hard onto Chrom's cock, finding no matter where he moved there was pleasure to be found, and it left him conflicted, moving frantically between the two. It ruined Robin's attempt to let everything slip into perfect concert, but she seemed happy just to watch Frederick come undone before her, to lose himself into eagerness and surrender to their desires for him.
Picking up the pace, Chrom kept mostly quiet, leaving all the sweet, romantic sentiments to Frederick. He was better as a physical lover, conveying with his hands and his kisses what he felt, than trying to speak what he felt. Physicality suited the exalt though, and his tight grip conveyed more raw emotion than Robin's ever could, and it let him focus his lips onto Frederick's shoulders as they tightened, the muscles in his toned back growing tenser and tenser from his and his wife's dual assault. In his own way, he let Frederick know how appreciated and loved he was, how much he wanted to emphasize that their relationship was, in his eyes, a very even matter. That as enjoyable as their dyanamic was, he was more than a mere 'marital aid' to them.
Chrom and Robin's combined skill meant that Frederick stood little chance once they had begun to work him over in earnest, their joint forces bringing him to a quick and intense end. But he knew there was no shame in coming so fast, in his surrender to their desires. He grew tighter around Chrom, moving recklessly between the loves of his life as his orgasm came down hard upon him, Robin reading him like a book but remaining in place. She didn't move away, letting him empty himself into her mouth, eyes lidded and locked onto his.
There was no intention to stop for the night, but intent on letting him settle into the afterglow, they put a pause on everything. Leaning back against Chrom, Frederick took deep, ragged breaths as Robin climbed into his lap, bearing more kisses down onto his lips. Nobody had more difficulty relaxing or struggling against their instincts and nature quite like he did, but the intensity of what had just happened, the realization they saw him as an equal who thought himself anything but, gave him the resolve he needed to know that he had to at least try.