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It happens organically. Something that Zach has been biting back for weeks. The way that Chris feels inside of him, the way he tells Zach how good he is, how good he takes his cock.
"That's it, baby." Christopher says above him one night, a hand on his hip and the other fisted in his hair, "You take it so good." He snaps his hips forward and Zach lets out a whine, his cock hard where its pinned under him. He wants to look back, to see Chris' face as he fucks him. But the grip on his hair is tight, and he's had a long day shooting and needs the ever loving daylights fucked out of him now
"Tell me," Chris demands, his voice low as he covers Zach's back with his body, his cock still thrusting into him as he clenched tight around him. "Tell me how good you feel."
"So good." Zach gasps, "So good, daddy." He doesn't mean for it to slip out, but it does. And before he can even take it back, Chris is fucking into him harder.
"Is that right, baby?" he asks, "You like daddy's cock?" he continues, adjusting his grip and slamming into him harder. "You want this?" he continues, and Zach can only let out a sob, his head nodding as much as he can. "Let me hear it again."
"Yes, daddy." Zach says, voice hitched as Chris fucks him with a particular rough jut of his hips, "Love daddy's cock."
"You want me to come, baby? You want daddy to come inside of you?" He asks, hi trhusts erratic as he chases and starves his impending orgasam, always waiting for Zach to tell him what he wants.
"Yes, yes daddy, please." Zach cries, "Want your come inside of me."
And that's all the consent that Chris needs before he leans down, pulling Zach's hair so that his face is angled outward and he can press a sloppy kiss to his lips as he releases inside of.
Zach clenches around him, his own orgasam following as he spills out on the bedsheets underneath them. He's sated. He's full. And Chris is pulling away and peppering kisses over his face and his jaw, his neck and his back, wherever he can reach. And Zach wants to melt into the sheets and live in this moment for eternity.
"I love you." Chris says, instead of voicing anything else, instead of bringing up anything else, instead of bringing up the fact that Zach called him daddy in bed.
And Zach smiles, "I love you, too."