Porthos is absolutely head over heels in love with Aramis's cat. He's constantly on the floor playing with the little darling, jingling toys for Bazin and watching him pounce on them.
Bazin starts a little at the scratching, but relaxes again soon enough, and Porthos waves D'Artagnan inside. "You need to work on that, you know. But I guess you can come in anyway."