This is a familiar sight according to my wife when a special friend shoves his long curved up cock in her pussy. Herr flat tummy rises and falls in perfect rhythm to his penetration and the bulge stays visible when he is buried deep and ejaculating semen in the deepest regions of her birthing canal. She can feel the strong pulsations of his prostate discharging cum when they are fully coupled during his climax. She likes to taunt me with descriptions of her extra-marital sex and states, “I can’t resist watching him make my belly rise because I know that I’m being a “bad wife” when I do it”. Then she laughs and shows me that her tummy is still completely flat and ready for another poking.