Extreme desperation is only display here as Last Kiss and Alisha compete to see who can hold in their pee the longest.

In this scene we find Last Kiss and Alisha engaged in a holding contest, and it is clear that things aren’t going to continue too much longer.  Both girls are extremely desperate, struggling not to wet themselves.  But, ultimately there can only be one winner.  As soon as one loses and has an accident, the other is free to let go and pee herself triumphantly.