Sibling Incest Story

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I'm trying to track down a really well written sex story that I read years ago.

Details: Its written from the perspective of an older brother, talking about the relationship between him and his younger sister (1 year younger). Starts when they are about 13/14 and the story continues on until they are in their mid 20's at least.

Their mother/father (cant remember which) are sick, and never come up stairs, the brother and sister have a room each upstairs and share a bathroom.

They are both swimmers, athletic and a very close (in addition the their sexual exploration and growth with each other)

They each also have other sex partners from school. There is a particular scene where the little sister masturbates with a female friend from school in her bedroom while the brother watches. Another scene where they go on a double date in a car to the drive in, and they both fuck their partners in the car at the same time.

I vaguely remember the story being called 'Siblings' but that hasnt really helped me track the story down.

Can /r/ help a brother out?