Maybe some car sex will loosen her up.

Emma slurps happily at your dick as you sit in standstill traffic on the way home. Your phone buzzes, a message from your parents telling you that Claire says hi, accompanied by a picture of her and Mom showing off their fresh pearl necklaces, courtesy of Dad. The sight causes you to bust, and you hold down Emma's head to make sure she gulps down every last drop. You don't want stains on your upholstery, this interior was expensive.

"Maybe we should just take the next exit and turn around," Emma suggests, "I wouldn't mind spending another night or two with Mommy and Daddy." You pet your slut lovingly as she leans against you and strokes your cock.

"Emma," you inquire, "you were really losing yourself while fucking my dad. Like, more than usual."

"Yes? What about it?" she replies. You know exactly what she's thinking, but you want to make her say it herself. You reach under her tank top to fondle a breast as you inquire further.

"What makes you so horny about fucking my dad, Emma?"

"Mmmm, he's just a hot stud, like you are." That's not the whole truth, you can tell.

"I know that's not it. You're going to tell me the truth, Emma." You put the car in park and pull off her shirt. She undoes her seatbelt in excitement and straddles your cock. You roll the windows down to get some fresh air, and to show off your girlfriend. You keep questioning her as you fuck, and when she finally cums she realizes the truth and shouts it out.

"I want to fuck my daddy! I want to feel him inside me! Oohh!" She squirts all over you. Your car interior ends up stained after all. But at least you know your next adventure with Emma. You drive home, and Emma tries not to attract too much attention as she flashes her tits at various motorists.

***

When you get home you immediately reach out to Emma's parents and plan a visit for the following weekend. You keep the plans to yourself until a day before and only then do you tell Emma that you'll be going for the weekend to her parent's home. You watch her closely when you tell her the news and you just see nervous, barely controlled excitement.