“Lulu, please! I’m about to pee in my panties!” Celestia cried out, knocking on the bathroom door. She wiggled a bit in her Luna-themed panties.
“You mean like how I did for a thousand years?” Luna sounded very displeased, but had a hint of pleasure on her voice.
“Ah! It’s coming out! I can’t stop it!” Celestia gave a strong whine as the loud pitter-patter of urine flowing through clothes and onto the floor started.
“Good, let it all out~” Luna chimed behind a soft giggle.