I never thought I would get an erection when my sister is naked! On a family trip, we took a bath together for the first time in a while, and my younger sister's breasts were so big that I couldn't keep my mind and my crotch was so big it hurt...

When I went on a family trip, I decided to take a hot spring with my sister! It's been a long time since I saw my younger sister naked and she had super big breasts, which was too exciting for me as an older brother! Wait, she's already an adult woman. I can't do it, I'll get an erection! Even if it’s my sister! But if I saw you like this, it would be the end of the story... But it wasn't! For some reason, my sister was fidgeting with me as well. And then he ends up crossing the line...