This smells like NTR shit. Not interested.
I 100% don't see that happening at all
Ritsu has been in love with Kyouko since middle school for god sakes lol. Is it going to be awkward between them? Yes. Is Kyouko going to get a bit more jealous with each passing chapter... Also most likely yes. I don't see the weird older sister banging chick to just magically steal Ritsu away because she only is blushing around Ritsu because she looks like her sister.
Also I love Tomoe she's so funny.
And "Let's just put the tits and ass away" by Kyouko as she got nervous and started getting embarrassed made me laugh way too hard after starting to get lewd on top of Ritsu haha.