I see unfortunately without it being infront of me, I can't say you might be missing since you said you followed the walkthrough.Yes, first in costume and after naked, as written in the walkthrought
That is unless you messed with game in anyway using the cheat mod, or increased relationship points too far.
Only solution I can think of right now is for you to grab the "Completes 0.20" save from the link in my signature and restart 0.21 of the walkthrough again.
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