I have not played Slave route since it was finished.I suffered this same problem and found the solution. Did you try playing the Love Route ending after playing on your Book 4 Slave Route save? If so, then what you’ll wind up with is Kya in the Pavilion, Shady somehow back when he should be gone, and a softlock.
Try for the Love Route ending after completing Book 4’s Love Route instead. That will negate the soft lock and all should work after that.
Kya appeared at the pavilion, got the clothes from the tunnel guards and dissapeared.
Shady left me a letter where he gave me the money and told me he was going away, but he DID appear when going to get the booze.
EDIT: Solved it, seems like the problem was that all the wedding things are supposed to happen BEFORE you go through the portal, and I had a save from an older version before proceeding through he portal, that is what was messing me up.
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