I don't think it's enough to raise the rating, but a little heads up on the content of the chapter. If you're not comfortable with steaminess then don't read.
(((())))
An expanse of skin sloped between Aizen's wicked glance into hazy steel grey eyes. Amazing how in effect of his dominion she still resisted his aggressive advances. Between the shuddering breaths and low moans she managed to steadily emit her will. She was playing a dangerous game, but games were not worth time or effort if anything less than a life was at stake.
It drove the ex-captain wild.
Rolling his tongue across her toned stomach he considered the mistake of falling for this woman's wiles, and found no fault in himself. He collected his rightful dues. She however left herself open to the dangers of association. She was captive. And she defied him. Her body and mind may have yielded according to the acts in which he bestowed upon her, but her spirit refused consent to his command, his will. She mocked him with smiles, smirks, and short laughs, fighting against him.
She was a match.
Aizen could not despise the fact, and yet he did somewhere in the dark of his egomaniacal depths. Love was far beyond his comprehension; possession was all he claimed.
When Rangiku managed to removed the top half of his uniform she chuckled softly, staring him in the eye. Aizen tore the ugly blackness of the shihakushou from her shoulders, meeting her fevered mouth in a cold passion driven insanely by the craving to control. This woman would bow before him again, not in her blood but with her spirit. Those demanding eyes would know utter sorrow and crumble under his gaze.
Those who contended with gods could do nothing else but fail.