It's because of the fact that Rihoko has so far been the least appealing of the girls plus the fact that each arc has been more enjoyable than the last in general that I'm really looking forward to it (surprising me).
I was already sure she was lying when she said she had her swimsuit on (she would definitely NOT be wearing a boob-tube style suit), but her pounce still had full impact.
Ai is officially going down in my books as Favourite Female Characters, which currently brings it to 5.