Esmeralda Greene has a rotund frolic with the eroticism of pregnancy in this entry in her "Greene Shorts" series of erotic short stories.
Michelle's tummy is big, and so is her sexual need. As happens with some pregnant women, she's finding that her sex drive has soared during her second trimester. Unfortunately, her husband is one of those obtuse and benighted men who find pregnant women sexually unappealing.
Poor Michelle is climbing the walls with sexual frustration, but one day all of her horny prayers are answered. In quick succession she finds three people who are eager to give her the sexual attention she's been craving: her ob-gyn doctor, who "treats" her on the examination table, her old college girlfriend, and the vigorous young man (and pregnancy fetishist) who's delivering her new baby furniture.
All in all, it's a busy and satisfying day for the horny mother-to-be!
This story is included in "The Collected 'Greene Shorts' Volume 3"