Twin brother and sister. He accidentally breaks her leg.

[taboosinoflust]

I remember a story where a brother and sister move with their mother to a new house with a basketball court, and the brother ends up breaking his sister's leg while playing, which makes him quite sad because she was apparently on the school team (I'm not sure about that part).

The story begins with them as children moving in and skinny dipping, then there's a time skip.

One thing I remember is that they both appeared to be unattractive and quite tall, which led to bullying.