If only Cirno had an older sister

well, it doesn't seem they are trying to fight each other. Actually, look pretty ok-ish.

Well, it seems it will have to be decided with some hot yuri then, ladies

it's hard to explain, man, so you'll have to trust on me and the power of yuri

KimikoMuffin said:
How does one determine who is stronger using yuri?

By knowing which one is seme and which is uke

Hijiri_Byakuren said:
By knowing which one is seme and which is uke

Got to disagree with you there thought that is true in some cases being the seme or uke doesn't say strongest as the roles can change depending on situation.