I don't have much in the ways of ideas for Margot, but with Seb, other than Aurora I have this guy Phinean who is a baby bitten wolf who's currently a rogue and will eventually join the Ameda pack. He's just met his mate Eliot though he doesn't really know what's going on with that. He could definitely use a mentor type figure!
As for Reese I have Emrys who will soon be purchased by Ibrahim's fledgling Rene, so he could definitely use a friend as well as Evienne who is a werefox who will be opening up a tea shop/cafe soon and is always friendly!