Sebastian snorts in agreement or wry amusement as he texts the Malfoys, before slipping his CiD away to kneel beside Velcro and speak reassuringly to him. Once he's confident that his dog is okay, he returns to Severus, "I was telling the truth about an inability to do magic. I've only got my patronus left, so if you could ennervate him, I'd appreciate it."

A little surprised at how solicitous and, barring the original attack, how pleasant Snape is acting towards him, Sebastian doesn't entirely trust the situation. He's fairly sure they're both around the same age, which ought to mean the first war ended and Snape should loathe him on sight for looking too much like James. Perhaps the Alternates (he can't and won't think of them as family) were right and he really is some horrid anomaly.