I did that with my ex the first time we fucked on her couch. She wanted me to blow my load on her stomach so the couch would not have a mess. I blew so hard it hit her on the face and in her mouth. She swallowed and gagged on it. It turned me on so much knowing she swallowed. The next night I put her on her knees and made her take a full load. Miss those days but don’t miss my ex.
I forgot to mention that my wife insisted that her nephew suck her huge tits to make a bond in their relationship that was like a son nursing from his mother's breasts. The simple act of sucking her tits actually achieved exactly what she wanted and it enhanced their ince*stuous affair to a higher taboo level because it felt more like a mother and son session of intercourse instead of an aunt and nephew. Apparently their role play caused their orgasms to become so passionate that my wife was actually convinced that she would become fertilized in the process. That didn’t stop her from having repeated sex with him and enjoying his family love seed deep in her womb.