After some research, it is clear on her site that Light Me Up is listed as a short sequel to Rock Me, which is book 2. So, it is in the correct order. However, Breathe Me In is a prequel to Leave Me Breathless so I have given it a 2.6 designation and moved it ahead of that book.
https://www.goodreads.com/series/6553...
Light Me Up, Ross Siblings #2.5, should actually be book #3.5.
Breathe Me In, Ross Siblings #3.5, should be #2.5. If readers go by what is on Goodreads right now, they will read them out of order.
The order correction I have listed above is also the order the authors has them in on her website. http://cherrielynn.com/books/