Severus caught Remus' questioning look and turned his attention to the cat in Miss Patil's arms - and he barely refrained from rolling his eyes. Trust his hedonistic brother to take advantage of any opportunity to be stroked and petted! Because if that wasn't Gaius, Severus would swallow a glass of undiluted leech juice. He wasn't certain if Miss Patil realized she was cuddling an Animagus - a male Animagus, at that - however, and so he remained silent on the subject.
"Miss Patil." He greeted her with formal courtesy and a slight nod of his head, waiting to see how she would react to encountering the formerly dreaded and reviled Professor Snape again.