#Chapter114 Sierra
Maybe he didn't know when he mated to her, and maybe when he found out that's why he banished her here, so the pack would never know and revolt against an alpha mated to an impure. I've never heard of anything like this, and it does explain his obsession with making sure Colton has the right Luna. Maybe he's afraid Colton isn't pure enough, and it will show in his offspring if he mates badly. Colton definitely has no knowledge of it, I would have seen it in our joined memories.
None of this makes sense. Luna Sierra was in the pack for decades before she had Colton,...