He caught a glimpse of her white teeth digging into her soft pink lip. Was she flirting - or nervous? It was hard to tell sometimes, especially in a professional setting where he didn't quite feel it was appropriate to flirt outrageously just to see her reaction. Even if he really wanted to. "Okay, so arches," he made a gesture with his hands. "Maybe some mirrors, gauzy curtains." That would make the space feel bigger too, without forcing customers to face their reflection on either side - presumably it wouldn't be necessary during perfume testing to see what they looked like. "Long table along one wall with... arched shelves behind to reflect the ceiling and hold more samples?"
He moved down the length of the room as he talked, pulling out his wand. "Do you mind if I take some measurements?" He waited for her nod then set the charm to working. It was broadly based on the one in Olivander's shop that measured people for their wands. "You run this place by yourself?" he asked, since they had a few minutes for chat while his spells did their work. "How long have you been here? I've never been in before." He gestured down at his own masculine frame. "Not sure I have much need of pretty underwear." He gave her a grin, because he couldn't help flirting a little bit.