A speedo girl

Because there, in front of the door, there stood a girl in a speedo!

"What the hell!?" Came from Tim.
"It's me, your dad! And quickly, let me in!" she replied.
To Tim's surprise, she sounded male and just like his father!

And before Tim understood what happened, she had squeezed past the door next to him!

"Hey!" Tim followed her quickly and threw the door into the lock, but then he saw that she had thrown her little bag on the floor behind the door and now stood in the middle of the room.

"Incredible! It looks like a pigsty in here!" she said in Walter's male voice.