As it turned out, Willow had made sure to explain that she wasn't trying to cramp Amelia's style in any way, and wasn't going to act like a parent or 'even a big sisterly type' (as she'd put it). She was simply going to drop her off right outside his door and disappear. She'd be back whenever Amelia was ready to be picked up.
As long as it wasn't too late. And definitely no all nighters.
Amelia smiled fondly as the redhead reminded her of this final rule and, with a shake of her head, knocked lightly on Scorpius' door. Willow, true to her word, teleported away by the time the knock had sounded. Shuffling the cake under her arm, Amelia glanced around in idle curiosity as she waited for her date (because she wasn't kidding herself anymore, this was a date, however mild it might seem) to answer.