Sorry this took longer than usual, it’s been a month since my last upload like last time.
 
The princesses go to the beach in their diapers & decide to go in the water. While Twilight lets Flurry have a little swim at the shallow end, Cadance, Celestia and Luna go a little further but still close to the surface and enjoy getting their diapers nice, wet and swollen.
 
I don’t usually have little lines on their mane and tails but somethings happened & to put it simply, I felt like experimenting a bit.