itch.io

Humorously, the two scenes you're missing are echoes of each other (same scene, different girls). The highlighted one is Maya, the treasure hunter - to get her scene (she's in the cave behind the tablet that lets you adjust the weather), you just need to complete all of her treasure maps. The one beside Vera is a nameless night elf in the Snowy Ridge (which you can teleport to using the crystal, or get past the moth monsters beyond the blue barrier). Go north to the cave (I think you have to break down a wall) and listen in on the two night elves scissoring (interact with the lit up wall at the end). You can then tell the elf outside about what they're doing, and she'll have sex with you to alleviate her boredom.

As an aside, your picture showed me that the scene I was missing was Santa Mary, so thanks for that. I guess I hadn't actually watched the scene on this playthrough, although I had the costume. Interesting that you need to actually watch the scene for that, but Samus Mary and Shibari Akane are unlocked as soon as you get the costumes.