Hello,
I have found a bug regarding the Healing Pond Elf Lady. If your character is a virgin for both receiving a blowjob and having sex, it will say that you have lost your virginity, however it doesn't actually register as such. Notably, after having sex with a different NPC (such as Rose), the sexual acts with the Elf Lady will act as normal (increasing your Top rank).
See attached.
Edit: I also noticed that the Elf Lady does not appear on the Pervert screen. As far as I know she used to.