Derek growled as Stiles bit down. Human teeth would barely break the skin, but it was the act that mattered. He pulled his hands free and rolled the boy over pinning him against the concrete floor as he bared his teeth.
His own erection was hard and straining, still trapped in his jeans, though the boy had undone his belt and zipper. It wouldn't take him long to rut against the boy and find his own pleasure.