To Hinamori he gives all his smiling geniality. She has a fetish for his glasses, and when they are together cannot resist tugging at them, perhaps hoping by her persistence that they will not be discarded. He lets her pull, but takes them off anyway, smiling his other smile at the look of grief that comes over her face at the action. She is a good girl, it goes without saying, but a foolish one nonetheless. He indulges her delusions, and reaps the reward.
She is self-conscious over her breasts, cannot bear to have him look at them for over a second, and so, as a consequence, he made her undress and stand over him for half an hour. She was horrified, the burning of her face becoming so as to spread over the whole of her body, chest all aflame, thighs scarlet, and Aizen watching all the while, the light of his glasses stripping her further.
He deliberately treats her gently, makes sure she is sopping wet before he enters her, his fingers playing over the palette of her body, a tug here, an insertion there, and always one for the tight crevice of her mouth. The response never fails to amuse him. On one hand, Hinamori is overjoyed at being his plaything, the one he chose to release his desire upon. On the other hand, her personality is essentially one of restraint, and to be as exposed as he makes her feel and be pains her like a wound. Thus, while he makes her cry (both from enjoyment and from pain), she is burning all the while, staring sorrowfully out at him from over-large eyes. His only response is to make her come, staining her body with their exertions, so as to make her even more shamed, and thus more hungry for him when he finally takes his leave.
To Ulquiorra he gives all his taciturn severity. The hollow is aroused by his authority, has been so since he was created, and for that alone does Aizen take notice, seeing in the solemn face the same begging need of his former lieutenant. His games with the man are different than those he plays with her, more brutal and bloody, but no less enjoyable, and so he spends the hours in darkest Las Noches. He has servants aplenty, but only one slave.
When they are alone, he has Ulquiorra unclothe him before anything else, watches as the hollow reverently lays his robes aside before discarding his own, the gaunt whiteness of his body exciting Aizen a little. His lovers, it amuses him to see, are mirrors of the other, for while Hinamori is consumed by modesty, Ulquiorra lacks the faintest trace of it, and it is precisely these traits that make his use of them so enjoyable. Whatever the one lacks, the other can make up.
He uses Ulquiorra roughly, deliberately scarring and burning the many tender spots on that body, making use of the many crevices to bespatter the hollow thoroughly, the other licking it up with adoring eyes. Their sex is filthy, Aizen's defilement of Ulquiorra causing the both of them to come frequently, with the latter always begging to be given the chance to pleasure his lord further. Sometime or other the eye will come out, and there is nothing Aizen enjoys more than to break it in the hollow's sighing mouth.
For that is what they do, his two lovers, sigh with longing for the sight of him, and since Aizen is an understanding God, he indulges them on occasion, enjoying the feel of their aching hearts in his callous, over-large palm.