At this point, I want Sei to suffer more. I want him to lose Liv. I want him to lose everything. This is all because he couldn't do the right thing and wussed out at the last second.
He tried to kill all of you and destroy your progress! That still isn't enough of a justification to kill him. At this point, I believe Sei won't kill Kei, even if he forces himself on Liv. That's how much of a slug Sei is.