Michael blinked at the question before immediately holding up his hands and giving a nervous chuckle. "Of course. I don't mind that at all. I'll just give you a cup with the top on it so you can bring it when you want." Because Merlin knew he didn't want to watch another guy jack off, even for science.
"But can I get the blood, and urine today? I can give you a cup to go pee in and bring back. Also maybe a saliva sample as well.." He got up to go collect what he needed, thinking about just what else he might want to take. "Oh! a hair sample!"