Yes, fuck her.

You fondle with your pants a bit until you pull out your dick.

You line up the tip with her pussy and hang the rest of your body over her. In one foul swoop, you push it into her. "AH! God!" She wraps her arms and legs around your body as you feel her vagina walls tightly pulsate onto you. You also look down to see Blue's sister writhing in pain. "Don't move yet! It's my first time..."

She huffs and puffs as she gets used to the pain she is enduring now. After a while she looks up and says, "Alright, you can start now..."

You start slowly moving your hips as you feel your penis rub against the walls of her insides. She continues to pant as you pick up the pace. "Ah, Ah, yes..." You feel her own hips thrust in time with your movements as the house fills with the erotic sounds of your dick sloshing in her pussy juices.

It does not take long before you both are rapidly thrusting at each other. "Oh, god...Oh, fuck YES! AH!" You hear her cries of pleasure ringing in your ears. "Oh, fuck, I'm coming...I'm coming!"

You feel at your limits as well.