What!? I didn't hear about this!!! The girls take on a mysterious project in the hopes of winning a reward! It's called the Swimsuit Intercrural Sex Challenge! They struggle with the unfamiliar intercrural sex, but as they gradually start to feel good, it's time for a slippery insertion! Unable to resist the pleasure, the 20 girls shake their hips with all their might, and they'll be rewarded with a luxurious prize...