I thought it would be just my mom, but then a mom friend from the neighborhood (with big breasts) joined us and we had an exciting hot spring trip. I'm shy, so I went to a mixed-gender hot spring with two mom friends! My penis reacted to being toyed with by their breasts...and then they played with me and I ejaculated a lot! In the open-air bath and in the room, I was sandwiched between their breasts, I put it in my pussy, and I ejaculated all over their boobs, face, and pussy, making it a very happy trip.