You let her be.

You shake your head and just go to take a piss. It takes a few minutes as you try to work your wood down. You notice Cassie's spandex suit on the floor. It looks even smaller off of her body. She then comes running in.

"Sorry, forgot...eep!" You forgot to close the door! You had gotten in the habit since living alone in this house. Now Cassie is leaning over to grab her suit and your now rehardening cock is in your hand at her eye level. She stays that way for a bit, frozen. You rub it a bit without thinking. You still really gotta piss.

"I gotta go, and you staying there isn't helping," you tell her with a wink, but she isn't looking at your face.

"Close the door next time!" she exclaims as she grabs her clothes and hurries out.

You manage to finally work your boner down after another ten minutes so you can pee.