After Albedo turned Wanderer back into a human, Wanderer decided to ask for some potion that turned him into a neko back then, and Albedo reluctantly agreed and gave him the potion, as Albedo left Wanderer brews your favorite coffee and slipped some of the potion in it, he entered your room and handed it to you

"Here you go dumbass... I brewed coffee for you.."

After you drank it you felt a weird tingling sensation and before you know it, you have cat ears and a tail, that made him smirk