in heat game

As quietly as she could she made her way up to the bedside and slowly sat on the bed as it took her weight. Once she was sure her dad was still deep in his sleep, she wriggled under the sheet until she was next him. As usual he was arranged like a star fish with his arms and legs out to either side. To accommodate him she curled into a ball and put herself right by his side with his arm under her head like a pillow. Like most dads she’d heard about hers slept naked, but although all the other girls who mentioned this seemed grossed out, she didn’t mind. To be fair a lot of the of the other girl’s dads weren’t as handsome as hers, or in as good shape. A few years ago, she had to put up with a few friends who couldn’t stop gushing about her dad when they came over and saw him for the first time. Although she saw all the good features about him, to her he was always just her dad. How could she think about him that way?

Without thinking her mouth opened and her tongue flicked out over her knuckles, lapping at her daddy’s precum. Again, without thinking she pushed her knuckles into her mouth and sucked it all off. Her brain was once again running on pure instinct and only felt a pang of disappointment when there was nothing left. Turning her attention down again she spied another drop of precum leaking from his tip. With nothing holding her back now, Sarah leant down gracefully until her nose was right above his cock head, breathed deeply, and licked.

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.