Incidentally, this has changed again and is now 10 Magic Candles as of V0.74. Looks like the news page doesn't have notes for this version yet.
Regarding the scenes at Lover stage:
As far as kinkier, I kinda doubt it since this started out as a non-adult game and has only recently branched out on the adult content path. Although admittedly, Nutaku-chan is a fair bit kinkier by comparison to the other girls. From the Steam forum: Nude Version Announcement.
Also, I doubt this will ever go hardcore given that you can change your character's gender on the Stats screen and the dialogue is more or less written to be gender neutral. I suppose this could change in the future, but it doesn't seem to be the direction the game is headed in right now.
Hopefully this isn't by design. Seems like the pictures should stay in the album after they're unlocked. Guess we'll find out once the support tickets get answered.
Edit: And the answer: looks like they're planning on changing it in the future, but for now it's not a bug per se.
Yes, it does reset by design at this time. Keeping the album images unlocked is on our roadmap
- Sad Panda Programmer
Thanks to your screenshot, I did some exploring and found out the Birthday Suit comes with unique dialogue for Intro, Seduce, and Poke. The other outfits seem to use the standard set of dialogue.
Also, if anyone is wondering about the Diamond Ring (like I was) it is actually a wedding dress outfit. Makes sense I guess--I just didn't think about it.