A copy book from Comic ☆ Treasure 27 just released by the artist on Pixiv. It's unfinished, so I'm guessing EO Masaka never got to properly finish it. These are his words from Pixiv.
I'm curious what triggered Gran's reaction on pg. 15. I'm sure it has something to do with Danua being a victim of past trauma. Also, is Danua hypnotizing him with her boobs unintentionally, or is that just Gran giving in to his desires?