Yussa smiles when he realizes what Caleb is looking for. His fingers drift over the bottles on offer and he passes one to Caleb.

"This should do, I think."

He has several different shampoos and he think that one will smell best on Caleb. And if they are going to be working in close proximity for a while, Yussa sees no reason why Caleb shouldn't smell the way he would like him to.

"Yes, absolutely. I want to know what that was." He'd certainly had a very thorough experience of the effect, but he'd like something that allows for more deliberate understanding on his part, even if Caleb decides to be tight-lipped about how to do it.