It doesn't take him too long, blessedly, to get to Sebastian's flat and let himself in - he'd set up these wards himself, for which he breathed a small "thank Merlin."

Once he'd settled her on the bed, locked the door and reactivated the wards, he set about seeing what sort of supplies they had. Ideally, he'd lock her up and go back to his work... but he began to doubt that it would happen.

Something to keep her asleep might be good.