If you do a google search for teen porn, you will find most images are of small, slinky girls with small tits. Some with pigtails some without.
You are selling youthful and innocent looking chicks who, at first, are shocked by penises but ultimately give in and are glad they did. At least that's what the internet has me to believe, lol.
Here are a few screenies for reference.
Best of luck
Happy Holidays