I'm a son who went on a trip to a hot spring with my mom friends from the neighborhood. All of them except for their mothers are busty and beautiful. They were so relaxed because they were just kids that they started changing in front of me, and we even got in the bath together, so their busty bodies and crotches were in full view. As we were washing each other's bodies, the wives, curious about my erect cock, grabbed it so that my mother wouldn't notice, and sucked it, and put it on their crotches...