For Eva/Yumiko beach scene:
- Just take sunbed when Eva is in the beach and she's wearing the bikini (the flowered one).
For the elevator (a bit more tough):
- The scene only triggers at morning or maybe noon.
- Eva must be wearing the skimpy bikini.
- I think she need high lust as well.
- You must be heading to your room.
- It is a random scene, that means sometimes even making sure all the requirements, the scene won't trigger. Just keep trying.
For Eva/Yvette pool distraction:
- They must be wearing the skimpy bikini (I think).
- Take sunbed when they are at pool.
- Scenes are random as well, sometimes trigger sometimes not, just persist.