Grandpa's Lesson - Ch.4 by NØHope Win/Mac/Android - Adult Sex Game

Grandpas's Lesson is a slow-burn NTR Visual Novel focused on gradual corruption, guilt, and forbidden desire.
You thought inviting your aging grandfather, Richard, to stay with you and your fiancée Suzy for a few weeks would be a simple act of kindness. After all, he’s just an old man — strict, traditional, and a little forgetful after his accident.
But Richard is far more than he seems.