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.