You were in her room, helping her stream. When you finished, she got up and went to get a snack.

Michelle: I'm gonna go get a snack. Do you want one?

You decline. She heads downstairs, but while she does, you get a good look at her big butt. You blush a bit. A few minutes later, Michelle comes back.

Michelle: Hey. Sorry for the wait. I got sidetracked by Dad.

She sits next to you, noticing your expression.

Michelle: You good? You look like you've seen something arousing.

It all clicks together. Michelle blushes.

Michelle: O-oh. You were… looking at my butt, weren't you?