There were a lot of things you knew your girlfriend had. But never knew this one..

You two were just laying in bed, you were peacefully reading your book, and she was cuddling on you..

Then you placed your book down on your chest and started to daydream of you and Marceline doing the things from the book to which you smirked and giggled with a red face

"Hmn?. What're you thinking of love?."

She asked. After a moment she also chuckled

"Oh?~ I didn't know you were into those~"