Rainbow Dash and Fluttershy having a nice time at the beach. By sunset they both need to pee, and neither is shy about peeing her swimsuit in front of the other girls, but they like it even more peeing their swimsuits together. Looks like they'll have a fun, wet night on the beach.

For more Fluttershy wetting pics that don't show any pee on her, search "implied wetting". Which doesn't fit here because the wetness is visible on Rainbow Dash.