I wonder if we should tag this as harem, I mean, after a kiss and they don't seem to start dating yet and she's already looking at her next potential target, huh?
I can totally see her best friend in love with her but the oneesan is hiding it (good call)... But even thought MC san likes girl, she didn't react at all with naked onee san, huh? I guess the harem doesn't cover everyone xP
THANKS FOR MORE YURI!