With that, she reaches into a pocket and produces a small vial of clear liquid. Unscrewing the cap, she drips some of the fluid onto her finger before bringing it to my lips. "Drink this," she demands, pressing her wet finger against my mouth.

I whimper and try to pull away, but Yumi's grip is unyielding. Reluctantly, I part my lips and allow her finger to slide inside, tasting the bitter tang of some kind of potion on my tongue.

As soon as the liquid touches my tongue, a warmth spreads through my body, starting at my groin and moving outwards in all directions. My bladder begins to contract again, but this time it's different - it's not painful anymore. In fact, it feels...good?

"What did you do?" I manage to slur between the waves of pleasure coursing through me. Yumi withdraws her finger and smirks.

"Oh, just a little something to help you enjoy yourself," she says coyly. "