IENE-433 My Big Sister Got Dumped By Her Boyfriend Who Cancelled On Their Hot Springs Trip, So I Went His Place And OMG We're Bathing Together In The Outdoor Bath And Sharing A Room Too!

My older sister brought her younger brother to a hot spring trip that was canceled by her boyfriend because it was a waste. She was supposed to go with her boyfriend, so of course she shared a room with a mixed bath. I Was Not Always Conscious Of Her Older Sister's Big Tits, And I Got An Erection! As she tries to hide it, her older sister approaches her, shaking her big tits. I thought that I would get angry if I found out, but my sister was involuntarily fascinated by her erection.