HKD-085 I Loved My Grandson's Body Nami Miyamae

Shinji, who lost his parents three years ago, is now under the care of his grandmother, Nami, who is also single. Nami dotes on Shinji so much that they have a physical relationship. They take baths together and Nami strokes his penis, and when she feels lonely, she masturbates alone thinking of Shinji. Where will this biased grandmother's doting love lead?