Hearing the proud Flame Alchemist break down, whimpering about wanting to touch his own cock to the mere thought of him, triggers an explosive, manic surge of dominance in the sin's chest.
An endless deluge of boiling hot, silver pre-cum floods down Greed's cock, acting as a thick, seamless lubricant that coats the insides of Roy's walls and floods out from the stretched seam of his fluttering rim, wetting his thighs and Greed's sheets.
He grips his thighs tighter, nails digging in just hard enough to leave marks as he pounds into him with deep, punishing strokes.
The heat between them is suffocating, sweat slicking both their bodies, but Greed only seems to revel in it.
He leans down, mouth hovering near the Alchemist's ear, hot breath ghosting over his sweat damp skin.
"You think about masturbating to me? Good. Good fucking boy, Roy. Next time you get the urge, you don't touch that pretty cock until I say so. Everything you want, your pleasure, your orgasms, this tight fucking cunt, it all belongs to me now," he pants through clenched, grit teeth.
The mattress groans beneath them, his bed's frame shaking.
Every single deliberate smack of a thrust sends a tight, wet squelch echoing through the vault, his balls slapping firm and dripping with sweat against the soft, yielding curve of Roy's cleft.
The feverish heat of Greed's synthetic fluids coats the inside of his pulsing walls, making the tight muscle ripple and squeeze frantically around his shaft with hunger that Greed thrives on.
But it's not enough. It's never enough for the sin of Avarice.
He intentionally drives deeper with every single stroke, grinding his pelvis hard against Roy's with relentless, crushing force that kisses directly against his overstimulated prostate.
And he only thrusts faster as the room fills with the obscene sound of his balls smacking against his ass.
"You're losing it already," Greed purrs, his voice dripping with smug satisfaction. The room is filled with the mingled sounds they make, both of them, every groan from the Homunculus shameless and torn with pleasure, every moan in between bubbling from his throat with his head thrown back or muffled against Roy's forehead or in the slope of his shoulder, wherever he can reach. "Back arched so perfectly for me, begging. You want me to ruin you, don’t you? Want me to fuck you stupid until the only thing you remember is my name and how full you feel— a-ah— hah—"
He pulls Roy’s hands up, pinning his wrists securely above his head with effortless strength and one hand of his own so that Roy has no choice but to take the brunt of his assault.
He reaches between them with the other, wrapping his fingers around his slick cock, stroking it roughly in time with his thrusts.
"Say it," Greed demands, eyes glowing in the dark. His head is spinning, his Stone a nigh constant hum, eyebrows pinched and expression a grimace, deliberately edging himself to keep absolute control over himself and his body. "Tell me who this cunt belongs to. Tell me who you belong to, Roy. I want to hear you scream it while I fuck you raw."
His pace turns savage, determined to break Roy apart how he wants.