Hi! Secret scenes are not published on any official walkthrough since, well... Are supposed to be secret!
Because of that, I'm not going to publish how to get those here in public, but since you sounded nice to me, I don't mind whispering.
Looks like PMs can't be sent here on Itch (someone correct me if I'm wrong), but if you can contact me on my patreon or f95, I'll be answering anything you need to know!