We Can't

Rain Winchester and Alice Walker are best of friends. They have known each other for what seems forever and are practically joined at the hip.
Brent Walker is Alice's older and very much attractive brother.
Your not suppose to be into your best friends brother nor are you suppose to be into your little sister best friend. But sometimes it can't be helped.
Brent returns from college to find his little sister friend has grown up and now she has all his attention as he has hers.