ANKB-045 — A voluptuous, seductive, and lewd older sister and her brother go on a trip to an open-air hot spring.

A busty, curvy older sister and her younger brother, who adores her and has a rock-hard cock, go on a hot spring trip together. The sister gently teaches her brother, who is very curious about the female body, and uses her dynamite body to give him plenty of naughty fun. The brother's cock becomes harder than ever because of his kind sister who is overflowing with maternal instincts. The sister climaxes in ecstasy from her brother's hard thrusts. The sister climaxes in various places, such as the open-air bath and the inn room, and the brother thinks, "I wish I had a sister like this!"