Porthos thinks it's something else, though. "I think maybe it's that we're bringing a stranger into this," he admits. "The orphans that we'd foster aren't permanent, either," he points out. "Two big reasons why he doesn't pale and get angry like he does when we talk about this." He hands Aramis the potato slicer and a bowl for them, sighing as he thinks of how much he hates that Athos is unhappy about something they want.