Don't expect the Automotive Missionary position to be the most comfortable Missionary you've ever achieved. Like most things having to do with car sex, it's all about the thrill of your surroundings; not so much the comfort and convenience. We understand if your disabilities are not honored with this position. If you are someone who uses a motorized wheelchair, you might try changing this position so you can receive oral sex from your wheelchair in the car -- and there’s nothing wrong with that!
If you're planning your car sex ahead of time, consider bringing a few sex toys along for the ride. Using your buzzing and textured friends can help both of you speed along to orgasm and reduce how long you need to stay in the Automotive Missionary position. As space may be at a premium while you're both enjoying yourselves, you might consider a cock ring, bullet vibrator or a couple's vibrator, as they are compact.
While you're at it, don't forget about other sex accessories. A towel or sex blanket will ensure you won't have to pay for upholstery cleaning later. A bottle of lube can help make penetration feel better for everyone and is especially important if you're going for a quickie. Safer sex accessories can be easy to forget, but if they're needed, don't forget to ensure you have your desired options at hand!
To eliminate any risk of indecency, you might try making your
public car sex a little more private in the comfort of your garage. There are many
roleplay scenarios that are perfect for acting out right when you get home, or even just on a day in. Of course, having sex in the car within your garage can also be a great way to try out any
car sex positions about which you're curious. Knowing what will -- and won't -- work can ensure you're more efficient if you ever choose to increase the risk by parking your car elsewhere.