Slim, gloved fingers softly traced along the outline of Ciel's creamy white thighs, Sebastian eyeing them with instinctive lust and hunger.
"Does my lord like it rough~?" Sebastian asked, his voice a smooth velvet that, uttering the right words, could push his fragile master over the edge.
Ciel could only manage to give a small, desperate cry for more, it laced with a certain begging tone that Sebastian thrived in hearing. The demon, along with a cruel smirk, let his hands glide down to slightly squeeze the boy's cock, positioning himself at Ciel's entrance as the younger started to gasp for breath.
In the blink of an eye, Sebastian had already pushed his incredible length at least halfway in, pulling Ciel's hips up to meet his own.
"My, such a greedy young master, taking me in so carelessly..."
A loud cry from the sudden movement left the younger's parted rosy lips as he glared up at Sebastian impatiently. "This i-is taking too long.. Nnhh..~!"
"Forgetting your manners so soon.. I shall have to give you more lessons in pleasantries." He replied slickly. Sebastian - finding his master's response highly amusing - and arousing, pushing in another few inches and delighting in feeling the boy's tight heat slowly adjusting to his massive size.
Letting out a loud moan from this, the boy barely had time to adjust before Sebastian thrusting the rest of himself into him. This ripped a scream of pleasure from the younger when his sweet spot was brushed against by the demon's member - it throbbing inside of Ciel and it taking no more than a few seconds for the demon to slowly pull out.
Once the sweet spot inside him was struck again, Ciel cried out, starting to moan and pant as Sebastian targeted his thrusts to that place and causing the boy's body to twist and writhe in magnificent ways. Knowing that his master desired more, Ciel's body physically aching to be roughly fucked and brought to tears because of how good Sebastian felt inside of him, the demon started to thrust his hips faster.
Ciel tried desperately to bring his hips to crash in time with Sebastian's, his back arching as the older male finally thrusted his full length into the younger. Though the speed still wasn't enough for Ciel, the boy's body aching to be taken every which way possible by the demon. Sebastian noticed this and grinned cruelly before thrusting his extensive size back in. This caused Ciel to arch his back as the pleasurable sensation washed over his frail body.
Sebastian gazed down at his master in adoration as Ciel's eyes rolled back in his head, the bed creaking below them so violently it sounded as if it could break any moment from Sebastian slamming ferociously into Ciel; the demon's thick member enough to make even the most experienced human cry out as the boy did.
As expected of him, Ciel eventually reached that point of being physically unable to take the sheer intensity of their sex any longer; the breathless younger letting out a final cry as ecstasy pulsed through him. Ciel's seed covered both of their stomachs, Sebastian letting out a proud growl into his master's ear as his own seed filled the younger.
Sebastian was indeed proud of himself for being able to make the much feared Earl Phantomhive - who was twitching and had tears of joy staining his red cheeks - his plaything.