My sister is a black widow

Introduction 1: The big loli in front of me said indifferently that her name was Natasha Romanoff. I looked at my white tender hands and blurted out: black...hehe? Introduction 2: Walk into the secret "red room" of the Soviet Union in the twentieth century in Marvel. Traveling on the Siberian Snow Country Train to find out who the lofty Kunlun and Kama Taj are. They possess the magical ability to change their molecular structure (similar to "Ant-Man" The ghost woman in "2" is not exactly the same) I never say that I am a hero, because I really am not. But my sister, Natasha, seems to have joined the Avengers at last? (Ps. The main universe is Marvel MCU, but because the initial era started early, some elements of the comic universe were inevitably added.)