Ayako. Middle school student second year. 14 years old
Haruka and Izumi. High school students. 15 years old

It was summer, and I remember it being insanely hot. We left our luggage in the room and headed straight for the hot springs.
There was no one there... just the three of us; we had the whole bath to ourselves.

Haruka thought we could play a game to spice things up:

"-I bet you girls don't dare to go into the men's bath with just your towel and stay there for a while?"
"-Are you nuts?, No way! I'm not going in there!"
"-Buuuu, don't be a drag Ayako. it'll be super exciting, trust me. Come on, rock, paper, scissors!"

I've never had much luck, so I ended up going into the men's bath with just my towel while Haruka encouraged me from the other side.
Luckily, no one was in there, so I waited for a little while and then returned to the women's side. I was just getting out of the water when I ran into a customer who had just entered the bath.

As the man was holding my arms, he pounded my ass nonstop, shoving his fat cock with force into my pussy. During the time he was fucking me, all I could think about was how stupid I was to listen to Haruka.