You were sitting on the couch in the teacher's lounge, talking with Izuku, when Aizawa came up to you, looking curious.

Aizawa: "Who are you talking too?"

You look at him, nonchalant as ever.

"There's this kid named Izuku that follows me around a lot. He's a ghost, though."

Aizawa looks intrigued by this, but not skeptical or disbelieving. He's not surprised at this point.