Dean was blessed with some thankfully chatty friends given his jumpiness about being approached. When first Seamus and then Susan approached his shoulders he stifled his initial flinch and rolled his eyes. He looked at the clock on his wall and winced. "Sorry."
"I didn't forget you, not as such, I just... got in the zone or whatever." He looked critically at the portrait and gave a pleased nod. "I made quite a bit of progress too. And she's a lovely lady. Friend of Braith's, tells fantastically dirty jokes." He set his palette aside and whipped out his wand to put the necessary stasis charm on his work.
Then he turned around and gave a slightly chagrined smile. "At least I'm predictable."
"Twenty seconds and I can grab the cookies and go." He started automatically preparing to leave by banishing his cleaning jar to the sink and protecting the palette from drying out before doing a quick visual inspection for anything he'd forgotten.