I would like to point out that Noru didn't tell the girls about Sarah's skills, even though they know he can see them. He has proof she's cheating and he's not giving it out because... why? Is he stupid? Or is he 'okay' with the idea of her stealing him if she can? Because the way he was envisioning it, Sarah's a sweet thing who'd treat him more special than the other guys.
... What an idiot. ALL TOGETHER NOW!
IF SHE BREATHES...