That Was Then, This is Now (paperback) S.E. Hinton
Does growing up have to mean growing apart?
Bryon and Mark have been as close as brrothers for as long as they can remember. Now things are changing, Bryon's growing up, and thinking seriously about who he wants to be. Mark still lives for the thrill of the moment. THe two are growing apart--but hoilding on-- until Bryon makes a shocking discovery about Mark. Then Bryon faces a terrible decision-- one that will change both of their lives forever.