I was so excited that it caused stains on my pants! I end up having a massage with my younger sister at a hot spring inn... When my family came to the hot springs, my younger sister was having a great time! I'm tired, so my sister...

When my family came to the hot springs, my younger sister was having a great time! As I was tired, my sister tried to call for a massage, but she was full of reservations. So I had no choice but to ask me for a massage. However, as I rubbed it, my yukata came out and I could see my breasts, thighs, and panties, and I got an erection! I touched my younger sister's sensitive parts all over the place, and this time she reacted to her, and was so excited that she started to get stains on her panties! "Hey... I want you to touch more"