I went on a hot spring trip with my mother and aunt (big breasts)... "It's okay because we're kids," my aunt said, so I decided to go into the women's bath. I was surrounded by a lot of breasts in the women's bath. I love breasts, so I couldn't resist and got an erection! My aunt noticed my erection and gave me a handjob in the bathtub! But my erection didn't go away... My aunt did even more naughty things to me, and it was a very happy trip.