Peopling [2019]

George Moody, who at nearly forty still lives at home with his doting mother, doesn't need a mate to produce offspring; he must be meticulous about bleaching his ejaculate and snuffing out the burgeoning life, because otherwise, his ejaculated sperm cells blow right up into tadpoles, sprout legs, and grow into full-sized doppelgängers that vie for his mother's affection. Usually, he's careful, but accidents happen.