Nush instinctively gravitates towards the 'Alpha' male. Jon's reappearance has shifted all the goal-posts in the house and they are all very intimidated.
I don't think Nush consciously flirts, some people are just like that and she is rather child-like in many ways-even her flirting is very schoolgirlish.
As for Steph, she is way down on my list of favourite people because of the dreadful side to her nature which became apparent while Lisa was in the house. It does not matter that Lisa was as hard as nails, the way she was treated was despicable.
[I didn't like the cruel, idiotic booing last night either, it made me feel really sorry for her even though I didn't like her much]
