Slumber Party was about Nina, her father, and her Uncle Mike.
This was a micro short story (only five chapters long), and it all revolved around Nina turning 18. To celebrate, she was allowed to have a slumber party with several of her female friends while her dad, her Uncle Mike (dad's brother), and some of their male friends were watching football. Nina wasn't fond of horror movies because they gave her nightmares, but her friends all told her to stop being a baby. Her uncle knew she was afraid of them, so he offered to sit with her.
While watching the show, Mike got handsy with Nina and whenever she'd start to protest, he'd guilt her into giving him what he wanted. Once he had deflowered her, he told her that it was her dad's turn next as his brother had told him he could go first, but her dad wanted to be next.
That's all this book was about, incest between blood-related daughter/father/uncle. It had no plot, no angst other than the fear of one of the girls catching them in the act, and no real spice. The whole thing was over almost before it began.
Nina was a bit underdeveloped and immature for having just turned 18. I couldn't say Mike was all that interesting, and there was virtually nothing to add regarding her father. The whole story was more ick-infested and uncomfortable than anything else.
This was definitely NOT my cuppa tea, and I only gave it a one-star rating. Perhaps I'm being unfair because the incest trope is NOT my thing, but even more than that, the whole thing was lacking continuity, plot, and everything in between.