Hey all, here's the guide for the more "harder to get" scenes!
The Star Cove Incident Walkthrough
Jaina x Aya scene:

-Just keep doing Jaina's scenes and the option should appear

Jaina x Zen scene:

-Do Jaina scenes until she submits
-Do Zen's scenes until she submits
-The option should appear

Aya x Zen scene:

-Do Zen's scenes until she submits
-Do Aya's scenes twice
-The option should appear

Jaina x Ria scene:
-Do Jaina scenes until she submits
-Do Ria's scenes twice
-The option should appear

Zen x Ria scene:

-Do Zen's scenes until she submits
-Do Ria's scenes twice
-The option should appear

Bad Ending:

-Ignore the beack on Day 1
-Ignore watching TV on day 5
-On the last day, break the disc

Corruption Ending:

-Go to the beach on Day 1 and choose to stay behind
-On Day 5, choose to watch some TV
-On the last day, break the disc
-Accept the offer

True End:

-Go to the beach on Day 1 and choose to stay behind
-On Day 5, choose to watch some TV
-On the last day, break the disc
-Decline the offer