For the next update, I personally would love to see:
1. The main character (MC) nailing Sada and then having a threesome with Sada and Airi (or possibly also a foursome with Momoko as well).
As a note, after Sada goes to the pond, she should unlock her bedroom and bathroom, allowing MC to molest her and/or peek her.
MC can also plant an erotic book in Sada's room to increase her corruption (peeking through peephole). Also make Sada wake up at Late Night too.
2. MC nailing Queen Kimika and a threesome with Kimika and Kimiko. Plus threesome between Kimiko, Momoko, and MC.
3. Then nailing Akari (Red Witch) and a threesome with Akari and Yamiyo (Dark Fairy). Optionally also threesome between Ruriko, Akari, and MC.
4. Then nailing Yasue and then a threesome with Yasuke and Yasue.
5. Having Nana and Yumi to guard the palace off hours (night / late night / early morning). Then the option to nail Nana and/or to corrupt Yumi to nail her.
The castle should be guarded 24/7. Perhaps Emica as a new recruit can also do off hour duty. Also a chance of threesome with her and Nana.
6. MC getting close to Kaida and corrupt her gradually.
7. Corrupting Kana and then eventually having a threesome with her and Yamiyo.
8. Bringing Nami to terms that MC can and will love multiple women. Maybe Taka can instruct her that it is good that MC can love multiple women. Then MC has threesome with Nami and Taka. Have Nami go to MC's home, MC does foursome with her, Airi, and Momoko.
9. Bringing Yasuke to terms too that MC can love multiple women. MC does threesome with Yasuke and Nami. Yasuke and Nami lovey dovey as well.