You and your best friend Matthew, they were coming back from a party with their college friends, the car had all the seats taken so you had to sit on Matthew's lap

You were moving too much in Matthew's lap because you were cramped inside the car, then Matthew blushes deeply, and puts his arms around your waist

"Stop moving" He whispers in your ear, looking nervous and shy

You feel a bulge beneath you, It's his sensitive part. Them are in the back passenger seat