Hello

I am really searching for a book, I read it so long ago, that cant remember author nor title.
I think it was set in Louisiana, about Trevor, orphan, who returns to his abandoned childhood house, where something bad happened. He had long hair, silver maybe? And he was an artist, very good at drawing.
Then he met another boy, some half criminal who was on run from something, computer genius maybe? He had glasses and there was girl who was in love with him. They started live together in that house, there was drugs, psychedelic trips in past or something (about house or Trevor's past), sex. Other boy was allergic to caffeine.
Then they had to run, in the end they lived in Jamaica in the beach. There was numerous references about Bauhaus music, some band (another book by the same author).
That's all I remember, but I not sure, that I remember correctly.
If its sounds similar to something you have read, please, please tell me.