Lulu324 Aku Dipaksa Memenuhi Nafsu Ibu Mertua Tobrut Aoi Yurika Indo18 Link Link

I should also consider the cultural aspects, as "indo18" might refer to Indonesian content, but the names seem mixed (Aoi Yurika) which could be Japanese-inspired. Maybe the grandmother-in-law is from Japan, given the name, and the setting is in Indonesia. That adds an intercultural element.