Caught by my daughter 🙊

I have always been careful when masturbating if my daughter is in the house, the thought of her catching me is mortifying and I wouldn’t be sure how to explain to her as she is 8 and hardly a baby.

It happened today 🙊 I wasn’t covered at all. I had the door shut but not locked. I finished then looked up and there she was, looking confused and disgusted.

How can I explain this to her?