DASS-900 · A Month of Showering Mom With Love, Then Repeated Baby-Making Sex With Her After She Lost All Reason - Hibiki Otsuki

In the Otsuki household, the father, Yoshio, is assigned to a long-term overseas post...
Mom Hibiki and her two sons, Haruki and Yuma, are left to spend their days at home. As the father's absence continues, the eldest son, Haruki, vows to "protect his mother" and directs strong feelings toward her, expressing his love for a whole month... The younger brother, Yuma, watches this with complex emotions, eventually realizing his own feelings for his mother. The brothers clash over their feelings, fight to win their mother's affection, and eventually reconcile, understanding and desiring each other.