But the last update regarding this game on his blog says he won't add threesomes since it's too much work, because he has to hand draw/animate all characters and variants, and he might consider adding the inkeeper in the future if it's just a single bonus scene after the end, for just one of the male characters. Post is from like a year ago, but his replies in the comments under it are far more recent and seem to confirm that he never went through with the innkeeper thing because he was focused on his bunny brothel game.
Also, the version history on DLsite seems to match the latest version someone linked here a few posts back.