John was alarmed for a moment or two when the plant started getting grabby--he'd seen firsthand what a hacked-off sentient plant could do, given sufficient motivation--but when its intentions became a bit clearer, he had to bite the inside of his lip hard for a long moment to stop himself laughing out loud. Apparently, the spell had worked too well.

"Calm down," he said reassuringly. "Doesn't look like it means to hurt you. In fact," he added, watching the besotted ivy rub up and down Draco's body like an overly affectionate green cat, "I think it likes you. Try sweet-talking it a bit, ask what happened here and see what it says."