Asgardian Embarrassment

They suspected that Loki's capture was no accident.

Black Widow interrogated him.

What she didn't know is that he cast the illusion of her butt being ridiculously big while she was talking...

She didn't know why he was laughing at first.
She didn't care.

The illusion did transfer to video, so she only found out much later when checking Loki's Case File what he did.

Black Widow thought about how she could get back at him...