Thosha Hi Thosha, I found something during Simons Route in Split the Party.
"Day 28 - After the short Aka scene, you'll get Nalili, go chat with her guard (southwest stairs). Choose "Defend guard", then "Yes".
Day 30 - Read "Succubi III"
Day 31 - Go talk to Esthera, "Tell". Go to Nalili's room and get Nalili's armour. Talk to Nalili, "Long conversation".
Training with the guard takes 1 day and reading Succubi III takes 2. So Day 30 should be Day 29. 🙂