Hey thanks for playing our game! Glad you enjoyed it! :) If you ever want to come back to it, you're always welcome to!
To get the 2nd last ending, you will need to max out Affection and Trust at the same time (which ends up being a bit of memorization and a little bit of a grind). The last ending unlocks once you've seen each ending once. I can't say more since it becomes spoiler territory.