@Takaflame Maho seems to be actively making her moves on onii-san though especially with this chapter (came into the bath, slept with him), in the past chapters she did tease on wanting to be with him just so that she's also under Maria's care lol. All aboard Team Dekopon. Or maybe a harem route with Maria + Maho since mom did approve already of the relationship between Maria and him lol.
The moment you realize Mom basically has a caged bed for her own safety, though I was genuinely surprise there wasn't anything breaking there.
I genuinely didn't expect best girl Maho to actually join the MCbowl; I honestly thought before Rui started falling for the friend guy it would be either an implied incest end or Rui getting together with onii-san out of pity.
I fucking love this development, Team Dekopon!