It's been 20 chapters and at least 5 of them had a line akin to "she had no idea what was coming".
I think the author isn't skilled enough to build tension and believable conflict, so he has to force it this way. Problem is: if you do it every other chapter it starts falling really fucking flat.
Also someone before pointed out the erotica tag being woefully inadequate - and I think the tag's here because it was previously called smut - and this is Smut in its purest definition: trashy content for young-adult women.