I love waking up to lips around my cock!
Side of the road
Parking lot next to a highway in daylight
Movie Theater
My wife and I both love it! It's a combination of the erotic vision of my cock sliding between her tits and the feeling of her body getting me off. She does have some nice sized, very sensitive breasts, so that helps.
Honestly, until we tried it, we had no idea why so many people liked it. It wasn't something I used fantasize about. Now it's another way for us to please each other.