Adult PC Game: Putting Cheeky Girl into Her Place! Pixel-Sex Life in the Hot Spring Town! v1.01 by Angel Observer Archive

A bewitching girl seduces "you", who has traveled to a hot spring resort town.
"Onii-san, you're a kind of person who loves a girl like...me?
*giggle* It's okay. I'll play with you for a little while..."
You were at her mercy, being lewdly played with and teased by her.

Putting Cheeky Girl into Her Place! Pixel-Sex Life in the Hot Spring Town! v1.01 by Angel Observer Gameplay Preview