After messing up their BB Slots, Gudao and BB get stuck in the slots room, with their only chance of escape being completing the punishment condition: Gudao must cum 100 times.

Being the diligent and loyal servant she is, BB jump on the opportunity to help her senpai Master. She even dons one of her summer outfits. Truly, the best kouhai Servant.
*All characters depicted in this work of fiction are adults, regardless of their visual representation or textual description, and are not based on any real person*