Oneshota Natsuyasumi

This RPG lets you play as a young boy named Yuu as he makes naughty summer memories with his older sister and the villagers. You'll spend one month of summer vacation. The sex scenes are animated, with a lot of stroking movements. There are six characters to pursue: Older Sister 1, Older Sister 2, Mother, Married Woman, Female Doctor, and Teacher. Each character has a branching ending.