Yea, new fu-ta! I guess her concern when she first found out he was going to be her new stepbrother was understandable and expected but he still liked her, so he had no other choice of plans but try to not make her feel uncomfortable. But then again, she didn't know he was going to take her rejection as well as he did. He was going to continue to show how much he liked her subtly and hoped she eventually came around.
Oh My Kami-sama! ... this time around, fu-ta gives us a FMC who's not a petite girl, but a "Sexy Onee-San", yet she still has all the important attributes of a FMC in a fu-ta story (know-what-I-mean, know-what-I-mean).
And we probably wouldn't want fu-ta to deliver his brand of H-goodness any other way.