If you're reading this book for the first time, I recommend you read the more recent chapters instead of the first ones. The first ones are really short and lots of them are just clones of other ones, so read the more recent ones instead. I'd say start at "Sleepover"
I don't write what I can't handle, so there's no death (except for like one but the title gives it away) or smut or cheating or anything like that. The only 'mature' thing about this is swearing from time to time