A tale of two Olafs

Just then, the door opened and in stepped what looked like Olaf.

"Ah, Olaf, you are back!" Christian said.
Just then Olaf started to grin. Next he said "I am not Olaf! Hi Daddy!" directed at Walter. Most surprisingly, it came out in a female voice.

"What the..." it came from Christian when Walter interrupted.
"Gentlemen, let me introduce you to my 19-year old daughter Sandra, she still goes to highschool by the way! Hi Sweetie!" Walter the bikini-clad blonde said and pulled his transformed daughter into an embrace.

"Damn Walter! Couldn't you have just turned into your sexy teenage daughter instead!?" one of the colleagues gloated.

"Wait a minute... If this is your daughter then what in all places happened to the real Olaf?" Christian suddenly piped up.