Looking for Stories

[Cetanska]

I'm looking for the titles of two different series. The first one is about a brother and sister who are the children of a cop starting out in high school. They fall in love with each other. The second series also takes place in high school. Main character is a new kid in town and he first meets a girl at his new bus stop. Later on in the chapter they are at a school dance. I remember the girl in question gets a key from another student which turns out to be a key to a teachers room. She and the main boy then proceed to have sex in teachers classroom