I think the quota was for someone else since they already discussed and accepted Shirley so it just means that Shirley will be his 5th instead of 4th wife.
This is what i like about harem in this novel not boring at all. Stardust always give us a reason, explanation and a moment through the story, why someone like the mc and back. No rush and no forced love and moment. Good job Stardust-sama god bless you.
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