HKD-138 - Hooked on my grandson's body, Haruka Higashi

Haruka lives in a rare three-generation household. Her husband passed away five years ago, and she now lives with her son, daughter-in-law, and grandson. With her son away for work and her daughter-in-law gone to care for a relative, Haruka and her grandson are left home alone. Haruka, suffering from pent-up sexual frustration, and her grandson, at the peak of his libido—what will happen when they are left under the same roof?