At the gas station

I get out of my car and walk over to the gas station. I´m just planning on buying some food at the cheap diner attached to it before I check into the motel by the highway.
Then I see something that makes me stop dead in my tracks. In a car to my side is a young couple, muscular dude, petite blonde girl. The mans eyes are closed, his head is in his neck, but the girl sees me. All of that wouldnt be special, except her hand is around his cock.
She keeps eye contact while she goes a bit faster, then slower again, the mans dick is decent size, she seems to edge him.
The girl winks at me, then I get going, I dont want the man to open his eyes and see me.

I go to the diner, and sit down at one of the tables and order some food. After some time, maybe 10 minutes, I see the girl walking past the window, and shortly after, entering the diner. Shes pretty. Small but cute tits, pretty longe, dark blonde hair, and big brown eyes.
She looks around, then she sees me. She smiles at the side and, to my surprise, comes over and sits down next to me.

"Hi" she smile.

"Hi..?" I ask, still a bit uncertain as to what she was doing here.

"I´m Madie."

I decide to go with it. "Nice to meet you. Where is your..."

She laughs. "Oh, I left my boyfriend in the car, he needs to clean himself up after the mess he made. And after that hes gonna check in for us. I´m gonna get us something to eat in the meantime."

Her eyes sparkle, and I begin to feel like her innocent looks might be deceiving.

"You guys stay at the motel too? So do I"

She laughs. "No way. I hope the motel is fine, the quality is usually not too convincing."

Then the waitress appears and gives you your food. Then she asks me:"Anything for the girlfriend?"

"Oh, I-" I begin, but the girl, Madie, is faster: "No thank you, I´ll order something for take away later."
The waitress smiles. "Alright."

Then Madie looks at you again. "So the actual reason I came here is..."
She makes a break to raise the tension. I look at her with a raised eyebrow.
"...I saw you seeing me edging my boyfriend in the car."

I blink, I´m surprised at her sudden directness. Then she ads: "And I want to know what you thought when you saw us."

I think about how I´m going to answer.