Players make decisions at critical "choice points" that determine which endings they unlock.
The writing does an excellent job of portraying the protagonist’s internal conflict. He knows this is wrong. There are moments of genuine revulsion where he tries to pull away. But the mother frames everything as “education.” She uses the language of self-improvement: “You need to learn this to be a functional adult.” “A woman’s body is not a mystery; it’s biology.” Yokkyuu Fuman na Boku no Mama no SEX Lesson Fre...