Draco could have announced himself, but all he saw was her hand dipping out every now and then for a berry, and he wondered just what it was that was so focusing that she couldn't hear him as he entered, couldn't sense someone was with her. That was dangerous, one part of his brain said, and the other thought she was rather... well, adorable.
He was carefully quiet as he moved to stand behind the chair, watching her without reading what she was writing for a moment, just looking at her, and then finally to the parchment. After a moment he smirked a bit, and asked, "And just who's bosoms are heaving? And what is he doing with his wand?"