Lust – Excessive thought or desires of a sexual nature.
Ron stared at Hermione as she sat doing her homework in the common room. He watched as she bit her lip, noticing how red and plump it had become when her teeth released it. He watched her slowly turn the page of the textbook, caressing the parchment with her fingertips. Ron imagined it was his skin she caressed to sensually. Ron sighed heavily as Hermione ran a hand through her messy hair; he imagined her doing that as she sat on top of him...Ron winced in pain as Harry slapped him on the back of his head. They were supposed to be playing chess, but Ron just couldn't focus with Hermione sat so close.