Mischievous pink-haired girl is Sabina, and the purple-haired woman is Aquila (Akurra, according to the kana, but Aquila according to DLSite English). I've wanted to see them together in a doujin for a while...and we get nearly sixty images in color!
I am confused about the resolution though - the preview pics from Pixiv (#114-115 here) were larger size.