Almost Smothered (asphyxiophilia)

I was recently with a woman who has large breasts (36DD) and during sex with her on top of me, she damn near smothered me. As I orgasmed I could barely breath but the sensation of near asphyxiation prolonged and heightened my orgasm (and hers). I've never tried asphyxiophilia or autoerotic asphyxiation but this was certainly a treat, albeit kind of scary. I never felt like I was going to pass out and knew that all I had to do was push her off of me so, even though I felt like I was being suffocated, I never felt out of control. Has anyone else here enjoyed erotic asphyxiation?