Признаюсь, в этот раз и до меня дошло не сразу

A teenage girl was being intimate with her boyfriend
setf.Jokes i 415 comments
At her parents house. Her father after being woken by the noises goes upstairs to check it out, and walks in on them.
"Dad!" she exclaimed in a panic "...I'm sorry"
The dad being a dad replies "hi sorry, I'm Dad!"