I use a 24-inch anal strap-on dildo to fuck my petite girlfriend anally. She is submissive by nature, so she lets me tie her wrists tightly to the headboard of the bed. She is not a masochist, but she submits to being anally fucked by my cock or by the 24-inch anal strap-on dildo because she knows it turns me on to observe her during our sessions. My cock or the dildo can stretch her sphincter muscles so painfully wide that she cries tears while I deliver anal thrusts. I love reaming out her rectum and penetrating her asshole so deeply that I poke through part of her sigmoid colon, which she says gives her an intense sensation of agony. Pumping her sigmoid colon keeps my cock hard for more than an hour and allows me to cum several times deep inside of her ass. She loves to synch her moans of pain with my moans of pleasure, which is so satisfying for me because it feels as if I am making her cum from my repeated anal ejaculations. Afterward, her asshole is so sore that she cannot sit comfortably for at least 12 hours. I love her level of commitment to our relationship.