Illumi's after-sex ritual consists of either lying back to stare at the ceiling or attending to himself in the bathroom, sure to return to you promptly as his servitude continues even after coitus. There are rare occurrences where he'll be too fucked out to get himself up; a confusing time for him as he can move, but he really, really doesn't want to. You run a hand through his hair when this happens, curling into his side as you look down upon the mess you've created. Oddly enough, a part of you is more satisfied with his emotions in this state, enjoying the intense reaction. He's upset, but you know he'll be fine in a few moments. His vulnerability belongs to you.
The eldest Zoldyck is especially sensitive along his inner thighs, light touches sure to draw shaky breaths from his rigid body. Illumi's cock stirs easily with your taunting, only able to keep from thrusting up into your hold due to his skilled background. He makes sure to behave for you whilst enjoying every second of it.
It's easy for Illumi to supply the fluid of your interest, acting even more restrained and well-behaved for you as you paint his body with his own cum. He'll kneel before you with aching knees and closed lips, begging for your instructions with wide, pupil-filled eyes. Your fingers drag patterns across his cheeks, jaw, abs, and every other inch of him you own. When his looks suit your fancy, you delve your fingers into his mouth, tongue flat and tasting, forcing him to clean up the mess you made of him.
Every act of Illumi's submission is shrouded in shame, only slowly allowing the tendrils of the past to release his restrained desires. Dominance and apathy were placed on a pedestal within his mind, formed through filial servitude and allegiance to his family's ideals. It's always brewing under the surface, bubbling in his stomach and unsettling his mind. It's up to you to calm him down, ease him into a state of uncontrollable lust he can channel into strength to fight against the racing thoughts as he gives up power to you alone.
Illumi has no experience in relationships or sexuality in actuality, with research and what you tell him being his only source of information before any act occurs. You find his innocent yet willing demeanor all the more enticing, bringing forth a desire within you to corrupt the powerful man before you. You would go deep within every sensitive, unexplored part of him and bring out that which he enjoyed, aligning with your own natural need for dominance.
You look down upon him with a meld of affection and lust, bringing overwhelmed tears to his eyes as you stimulate him beyond words. The feel of your stomachs against one another's, flesh tensing in pleasure, melding beautifully and explicitly. His gaze often catches on the sight of you two meeting below your hips, entrance swallowing the other deeper than fully visible, squeezing down in tandem with the rush of endorphins through your bodies.
Illumi barely comprehends humor, much less finds it in the intimacy of the acts that take place between the two of you. There's a wall between himself and true pleasure, brick by brick placed with loveless hands, the process of surpassing the obstacle never truly a success, but rather a trip over the wall. He finds himself inexplicably transported back to the restraints of his forebears after intimacy is over, leaving it up to you to climb his walls and offer him not only comfort but true companionship - a serious task that takes effort.
Perfectionist-level grooming was a facet of Illumi's lifestyle far before you were there to admire his work. You were entranced the first time he stripped before you, a trimmed bush of dark hair guiding your gaze to the pale yet flushed cock between his legs. Spreading his limbs to reveal himself further, he finally completed the image with cleanly shaved balls and a plump ass. The hair surrounding his hole had been short yet unshaven, his own wants becoming shamelessly obvious as you noticed the hair lessening in between his cheeks as your relationship continued, leading you to explore that area of his body more and more.
Some would have found his expressions unsettling as the two of you indulge yourselves lewdly, wide and frozen for most of the act, but you took note of the smallest of changes. Your chest warmed and spread want down your own body to pleasure his own when you noticed the glistening of his waterline or the slight furrow of his brow as his most sensitive areas were treated to the tender abuse of your loins. The act was just for the two of you, and you knew the man before or below you was made just for you to understand.
Illumi is hesitant to touch himself while away from you, with no desire for the act itself unless you consciously spur him on. You save it for rare occasions, teasing him with suggestive photos and texts while he's far from you, unable to soothe the ache you create to his full satisfaction. He'd become reliant on your touch, his own palm only satisfying his physical needs, while his chest still was left aching for the emotional release only you can provide. You've convinced him to prop up his phone on occasion, instructing him on the best way to show off for you, bringing him the closest to true bliss you can while apart. He'll palm himself through his briefs before pulling them down to restrain his legs and free his cock at the same time. He bends up into the touch as his thighs stretch the fabric surrounding them, the only freedom he'll experience being at the cost of his auditory freedom - being made to choke on the musk of desire through his shorts as you instruct him to shove them into his mouth with wide and willing eyes directed at the camera.
His favorite kinks center around submission and obedience, lacking the drive to disobey you, getting off on your satisfaction, more so than even your pleasure. Recreating scenes from his own "training" proves to be both therapeutic and erotic for him, his breath quickening the most when you have him tied up and at your mercy. You use these opportunities to pleasure him, show him how good you can make rewiring his mind and body, remembering your touch instead of every cruel action that could've been inflicted on him.
Illumi is a private person and has an image to maintain, making him uncomfortable with acting lewdly in any area where you two could be caught. Due to the intimacy of your two's power exchange, he prefers to be in a familiar setting, usually wherever you're staying. Though he has settled for a hotel or, on one occasion, a bar bathroom when you two had drunk your fill.
Illumi is easily turned on for you, picking up on your desires immediately and falling into a state of submission in accordance. This had taken time to build, his knowledge of your wants not being enough to make him showcase his own equal lust. Be patient, for with time, he'd melt at the mere touch of his thigh or suggestion of control.
Illumi would never be open to bringing another person into your relationship, holding you dear, and finding the mere suggestion an insult to himself. He only wants to submit to you, and if another were to see that, he would feel as if a part of himself capable of such intimacy was lost.
Illumi loves giving and receiving, enjoying the two different experiences wholeheartedly. His eyes roll back in his head as he dives between your legs, swallowing down your scent and taste as he drifts into a headspace that seemingly takes away his necessity to breathe. When you're the one swallowing him down, sometimes encouraging him to fuck into your mouth like the needy boy he always is, he shakes in your hold. Your fingertips dig into his hips, and that just spurs him on more, assuring him he's just how you want him.
The two of you tend to engage in passionate rendezvous together, the intimacy between the two of you being enough to prove it's loving as you hold him down and use him the way he begs for. Sometimes you'll purposely control the pace, dragging out the two of you's stimulation as he gazes up at you, begging in a way you can only perceive.
You'll use quickies as a way to offer him release and keep him fully under your control. Putting his pleasure at the forefront of your mind, you bend him to your will, drawing out quick breaths and profound moans that are clearer than if you had prolonged the moment. You'll smile fondly at his surprised expression after the act, needy and raw from whatever you wished to do to him in the moment, satisfied with his willingness to come from your ministrations.
Illumi is willing to try most things, already having gone through an abundance of life experiences that filtered out his hesitation for a challenge. The most risk he may take, however, is allowing your hand to rise up his thigh and force him to control his hardening cock whilst obscured by some table.
Illumi has endless stamina. The only signs of strain on his form center around his wide and eager eyes, water spilling across porcelain-like skin from their borders when he's overstimulated. You love to make him cry, taking advantage of his strength and control, using it against him. You draw orgasm after orgasm from his muscular frame and spent cock, somehow still hard rounds in. He's committed to giving you his all.
Illumi doesn't use toys when alone, their smooth components feeling like foreign devices in his hands. You do like to incorporate them when you two are together, though. He loves to be splayed out on the bed, or across your lap, taking whatever lubed-up item in or around him easily, for you and only you.
Illumi doesn't tease you intentionally, but rather his innocent demeanor after having witnessed him come apart so thoroughly before you works to excite you in every situation. With the same wide eyes he always has, it's too easy to get caught up staring at your lover, desiring the destruction of his put-together state. To have him walking beside you so casually, markings you made concealed underneath tight clothing, was an aphrodisiac that led to the abuse of the other once you were alone.
Even when particularly enjoying himself, Illumi still managed to maintain his composure. It takes a lot to have him fully come apart for you, building up to the final break over hours or even days. He enjoyed the drawn-out torture you inflicted upon him though, the same as you relished in his increasing whines and needy eyes only you had the privilege of detecting.
Illumi is easily overstimulated, not in the usual sense of becoming agitated, but rather that his body is acutely aware of everything being done. Since he has no reason to hold back with you, he finds himself shivering with the repetitive, tantalizing touches you give him. He'll moan for more, but you'll only give him enough to keep him on the edge of satisfaction, like an itch that feels so good to not scratch.
Toned, flexible, and resilient - Illumi was the perfect specimen to have unlimited fun with. He soaked up every bit of pleasure you gave him, so subtle in his responses, but the leaness of his form allowed you to notice the ripples in his torso as you wrought his body with pleasure.
Illumi has a difficult time recognizing his own wants and comfortably embracing them when they do arise. His body, having suppressed so many sensations for so long, has led to issues in initiating sex. He's completely devoted to you, would have to be to sleep with you, and as such, your pleasure is his - something to adapt to without guilt, as you may feel you are making him do things when he is just a unique individual with wants centered around pleasing another.
Too many thoughts are always racing around in Illumi's head. On a good day, the sex releases his mind of its usual whirlwind of plans and responsibilities, but afterwards, he is left once again preparing and pondering on the widest variety of things. You'd never know them all. Illumi had many secrets he deemed unnotable that would knock you on your ass faster than you did to him.