[Yamada Shoukai] Boku dake no Zettaiteki Onee-chan [MTL]

An anxious younger male confides in his dominant older sister, who promises his first sexual experience and eagerly embraces his shy confession. Their intimate moments progress from tentative touches to passionate embraces, with the sister guiding his eager body while he expresses heartfelt gratitude. The story culminates in a tender farewell, leaving the promise of forever lingering between them.