Agunosutosu - CUCKOLD RPG: hood Friend Cucked - Tiria is an Obedient Sex Slave Final + Full Save (eng) - Adult Sex Game

You can only see that your ch*ldhood friend is being cucked in this game.
The protagonist does not speak. What he feels is left to you.
Almost no battles. The story progresses by exploring. There are day and night times.
The total playtime is about 2~3 hours.
14 H scenes in sprite-sized pixel animation (voiced)