J.k. Rowling said this quote
“ With another shock of excitement, Harry saw Sirius give James the thumbs-up.Sirius was lounging in his chair at his ease, tilting it back on two legs. He was very good-looking, his dark hair fell into his eyes with a sort of casual elegance neither James's nor Harry's could ever have achieved, and a girl sitting behind him was eyeing him hopefully, though he didn't seem to have noticed. ”