I fired up the 3D software and my dick was already throbbing. There she was on the screen, my sister Emily, her digital body naked and spread exactly how I wanted it. We had been making these renders for weeks, both of us twenty-five and twenty-three, adults who knew exactly what we were doing. The models got more explicit every night. Tonight I added the final touches: her big tits heaving, her shaved pussy lips parted, my thick cock buried balls-deep inside her.
Emily walked into my room without knocking. She had seen the file notification on her phone. "You finished it without me?" she asked, voice low and rough. She was wearing nothing but an old t-shirt that barely covered her ass.
"Get over here and watch," I told her, clicking play. The animation started. My 3D self slammed into her from behind while she moaned like a whore. The sounds I had recorded were real, taken from her last time she fingered herself thinking I was asleep.
Emily leaned over my shoulder, her breath hot on my neck. "Fuck, that's hot. Look how deep you go in the render." Her hand slid down and grabbed my real cock through my shorts. "Make it match this."
I stood up, spun her around, and yanked the shirt over her head. Her tits bounced free, nipples already hard. I pushed her face-down over the desk so she could watch the animation while I freed my cock. "You want the real version?" I growled.
"Yes. Fuck me like the render."
I spread her ass cheeks and drove straight into her wet pussy in one hard thrust. She was soaked. The screen kept playing, my digital dick pounding her digital cunt in perfect sync with the way I was railing her now. Every slap of skin echoed the animation's wet sounds.
Emily moaned loud, pushing back to take me deeper.
"Harder," she demanded. "Make it match the file."
I grabbed her hips and fucked her like I owned her, the way the 3D scene showed. Her pussy clenched around me every time the animation showed me bottoming out. I reached around and rubbed her clit the exact way the model had it programmed. She came fast, soaking my balls, but I didn't stop.
I pulled out, flipped her onto her back on the desk, and shoved back in. Her legs wrapped around me. On screen my 3D self was now fucking her missionary, so I copied it, pinning her wrists and pounding deep while she watched. "Look at us," I said. "That's us fucking. That's what we really are."
Emily's eyes stayed on the screen. "Keep going. Don't stop until the render ends."
The animation looped. I kept fucking her through two more orgasms, her pussy gripping me tighter each time. When the loop hit the creampie scene, I buried myself to the hilt and unloaded, pumping thick ropes of cum deep inside her just like the render showed. She came again when she felt it, crying out my name.
We stayed locked together, breathing hard, watching the animation loop one more time. Emily smiled up at me, cum already leaking out around my still-hard cock.
"Render the next scene," she said. "This time make it even dirtier."
I smiled back and hit save on the file. We were just getting started.
