An open slit would drive anyone crazy. When this bud is so attracted to inhale its aroma and enjoy the taste, when the woman herself does not mind to be fucked - it is impossible to stop. And the desire in her eyes pushes to plunge into her as deep as possible. How can you resist the temptation to cum inside her? What a bitch - she smears the juice with her fingers and tastes it. And she likes it.
I take it this is one of the varieties of the ride around town. Guys offer bored ladies a ride around town in a car, and the ladies thank the guys for it this way. In this case, it turned into a threesome.