Steve threw his keys in the bowl as he got in. "Dad? Kathryn?" Odd. The lights were on, but no one called back. He jogged up towards his room. "I'm just heading to bed!" he called out, but to get to his bedroom, he had to pass his father's...
And the sight he could see through that door was his sister, naked and on all fours, her D cups hanging below her, chubby hips apart as their father's elderly paunch rode atop it, jackhammering his own daughter. "Daddy, how many loads will this be?" Kathryn panted, like the wanton slut she'd become.
"This'll be load number five, sweet pea!" Their dad spanked Kathryn and she let out a schoolgirlish giggle. This was when Steve stormed in.
"What the fuck are you guys doing?!" Steve demanded, but the pair didn't even slow their lovemaking. Kathryn's eyes were wide and bleary. It all made sense. She had to fuck Steve's dad.
"You've been a real... nnngh, harder, Daddy... dick to me lately," panted Kathryn triumphantly. "So, I... yeah, make me your little cumdump... fucked your dad!"
Steve looked incredulous. "Kathryn. You're fucking your own dad!"
It seemed to break her reverie a little, and she slowed her undulating hips even as her dad kept fucking her cunt. "Wait... I... uh..." As her dad gripped her hips, she yelled, "STOP!", but it was too late, a fifth load spurting into her womb. Despite her realisation of how perverse this was, Kathryn came, her cunt spurting all over the bedsheets, tweaking her hard nipples and moaning like a bitch in heat.
Her and Dad lay back on the bed, spooning, Sean looking on utterly disgusted. "What the fuck are you two doing?" There was about an hour of tearful discussion as the spell wore off, and they realised Kathryn had been the victim of a terrible spell. "What kind of salon even is that, Kathryn? Jeez." They resolved to get some sleep, and in the morning, get the morning-after pill and report the salon to the police.