Why not both?

You decide the best option would be both, since there's no reason not to. The car should be able to keep from wrecking itself, right? Not really your car anyway. You begin fucking the writhing blonde's ass faster while pressing the accelerator to the floor.

The wheel twists and turns in ways that you assume means that the autopilot is passing other cars and keeping itself on the road. The car hasn't slowed down yet, even gaining speed, so it's probably fine. You're more concerned with the huge tits pressed in your face than your own safety at this point, now nearing orgasm from the tight asshole moving up and down your cock.

She seems in near perpetual orgasm, possibly due to the piss intoxication, but her screams were clearly exaggerated for your benefit. She squeezes your head deeper into her breasts, further obscuring your view. You reach the point of no return as you feel the thunk of the car going off the road.

The car does its best to slam on the breaks before hitting the obstacle it senses you're heading towards at full speed, since you clearly aren't going to do it, but it can only do so much. Jennifer's vehicle slams into a tree at the same time as you begin shooting your load up her ass.

The expensive automatic car managed to slow down enough to minimize the impact, but the airbag blows open, hitting her in the back and knocking her ****. Your head is protected comfortably between her breasts as you milk the last of your orgasm into her motionless body.

"Oh Jeez, that was incredible. Are you alright?" You say to the ragdoll still sitting on your dick. She's still breathing and seems relatively uninjured, the steering wheel cover just managed to hit her in the back of the head as the airbag went off.

You open the door and scoot out of the car, carefully placing Jennifer in the driver's seat so it appears she was driving. You pause to clean your cock off in her mouth, but she makes no effort to help, for obvious reasons, so you opt to wipe off in her hair before putting it away.

You stand back to survey the damage. The car is probably totalled, wrapped firmly around a tree in the middle of a park. You look back at the path the car took to get here in shock at how many obstacles it avoided before now. There are several other accidents at intersections you passed through in the distance.

You hear sirens approaching the park. Better get a move on. You don't feel like trying to explain this one to the cops. They'll probably just assume she was driving alone if you can get out of here now.

You look around for escape options