1/2
[By now the admission that Mickey considers them friends isn't all that surprising, and Sebastian doesn't look taken aback by it. Instead he listens, quietly and with a somewhat thoughtful expression.
Okay, so. Some facts about Sebastian:
1) he has lived for several hundreds of years
2) during all that time he's managed to make exactly one friend, and only within the last year
3) he fully admits to not quite understanding friendship or what exactly constitutes as one
So you'd think he'd be happy to have more friends, or at least defer to other people's expertise on What Are Friends, but... Mickey is someone he feels mostly indifferent and slightly judgmental about. For all his limited understanding, Sebastian doesn't think that's how you're supposed to feel about a friend.