mooncakeva of

Her heartbeat raced wildly, and her breathing came hard through her nose as she sat there in silence with her lips wrapped around her father’s dick waiting for his orgasm to end. The cum had pooled at the bottom of her mouth, like a lake of magma that jiggled with each ragged breath. She dropped her tongue into it and lifted, letting it drip off the sides of her tongue. Finally, her father began to soften in her mouth, and she felt safe pulling away. She squeezed the head with her lips, making sure not to let a drop escape and with a final jerk his semi-flaccid penis slipped out, bouncing off her chin and back onto his thigh.

She walked up to the mirror and opened her phones camera and hit record. In the bathroom mirror she looked like quite a mess, no make up on her face but a shiny layer of cum and drool covered her mouth and chin. She turned her face left and right getting a good look and seeing that she had truly plastered her lower jaw. Next, she opened mouth and angled her chin down. Sitting in her open mouth was a pool of thick white cum. Her father’s cum. The thought made her squeeze her legs in ecstasy.

idk if you've played chaos;head (or watched it, I never saw it so idk if it's in the anime) but it's set in the same world as steins;gate (which I've watched but never played) and things the eyes see but the brain doesn't process are a literal plot point, you could almost certainly make a fairly lore accurate manip with that if you like this world.