Aki needs someone who will really love and treasure her. Right now, most people agree that the best choice is Miki, who is very obviously head over heels for her oneechan. You can't do wrong with sisterly wincest! 
Oohhh! Yes, please!
All aboard the Aki x Miki ship!

The good ship Aki x Miki releases pink steam? So gay! XD
Interesting. I re-read the whole thing and Miki had a boyfriend, seemed to be a mutual break up. I wonder how much of that break up's cuz of Miki's feelings for Aki.
Near to 0. There isn't a single hint for incest. Miki is just proud of her sister, nothing else.
Yep I don't sense a single bit of incest and that'd be kinda weird ngl, just from looking at it I already ship momoka and aki.