This is the light at the end of my long, dark tunnel. Finally this masterpiece got translated. This doujinshi is a miracle, much better than the sequel imo.
The crossing of the line felt quite organic and natural, such a genius idea. The mother initially tries to hide her pleasure and is in denial. She is aware of the immorality of this desire, making it feel more authentic. I appreciate when incest stories emphasize that feeling of shame by breaking a taboo that such a subject inherently carries.