I hope we'll get to see more of Ane-san in her swimsuit next time...
By the way: The title might be "All About Ane-san" but we are fare from knowing all about Ane-san...
Her younger brother...Right, it's the protagonist from the release "All about sis' friends" from this artist.
I did hope at the time to see the sister get some action too, so here we go. Awesome.
Well, her younger brother has a harem, and she pretty much got herself a boyfriend of sorts by the end...So no need to feel inferior to him anymore, I'd think. This protagonist seems like a nice guy after all.
Opinions may vary, perhaps ... but I'm still trying to wrap my mind around the idea that two females being with the same male at the same time constitute a "harem". Personally, my minimum requirement for that is three females.