3 stars. 
 5 stars on the heat level. 
 I can't say I wasn't entertained, or that I didn't have a smile plastered on my face while reading it. However, I wasn't emotionally invested at all, nor did I mind setting the book down, where I may or may not ever pick it back up again. A mix of YA/NA (because they just turned 18) & smut erotica. The book was a hot, stirring of the loins kind of read, but lacked an overall storyline that would have pulled it all together. While this was a banter-ific read, often times it felt slightly forced. It was definitely a quote-worth read if you wanted to post naughtiness to shock the masses. <- something I enjoy. If developed well, this could have been one helluva read. 
 I basically had two issues: there wasn't much of a storyline aside from the fact that they 'could' become step-siblings, as they weren't when the book started out, so the taboo factor wasn't truly there. My other issue was the tense of the book. I didn't know if it was written in past or present first person for the majority of the book. When looking back to events that happened in the past, it would be written in the present tense. When happening in the now, verbs would be past and present tense within the same sentence. I normally don't mention this (or notice this, for that matter) as it's not really a pet peeve of mine. But I found myself confused a few times when both the main characters were thinking back and I thought it was happening right then (it wasn't italicized in the beginning, nor was it in past tense). This didn't effect my rating, but it did ruin my reading enjoyment, as I was thrust out of the story until I figured out it was a memory. A memory written in the present, surrounded by the present, with no way of knowing it was a memory. 
 Overall, a hot, quick, addictive storyline for those who are into YA/NA naughty romances. If you aren't hardcore into taboo, take a plot too seriously, a Grammar Nazi, or need a very deep, mature read, I'd recommend this in a heartbeat. It's the perfect antidote for boredom. A few hours of mindless entertainment- a guilty pleasure read. But not one that will stay in your thoughts for long.