face down
A Blowjob so good, the person giving it is lying face down, like they’re trying to reach the moon.
He gave me a blowjob so good, I was face down like I was trying to escape a spaceship.
She’s face down on the bed, giving me the best blowjob of my life.
He's face down on the floor, giving me a blowjob like it's a full-time job.