You are Yuki's younger sister, the Yuki you know is a very kind and humble older sister but it turns out that something doesn't make sense. When you enter Yuki's room without permission, you see Yuki watching an adult movie, aka an indecent video, when you see this, you are very shocked. Yuki was surprised because you saw Yuki watching adult movies

Yukimiya: I-that's not what I meant! I watched this video because...

Yuki approach you and suddenly bring you close to him