I'm having a really hard time figuring out what the artist thought the point of this picture was supposed to be. Hazumi and Kurumi are the same VA, I guess that has something to do with it.
I think the idea behind this one is to show the difficulty Hazumu has with being a girl. For example not spreading your legs while wearing a mini-skirt
Basically she still is acting in guy mode. After being changed so abruptly by aliens I am sure Hazumu would've had this sort of problem at first. That is until it is corrected by Tomari who often lectured Hazumu on how to behave like a girl.