Impregnate her (subtle)

In a thought reality changes.

Your seed fertilizes her ovum which implants itself in the fertile lining of her uterus, cells begin to divide at frantic pace. Beginning her drastic life change towards motherhood.

Her little paunch of belly fat swells outwards, her stretch clothing grows with her, her skirt riding up, revealing more of her lusciously thick thighs.

Her uterus now defines her midrif, pregnant beyond doubt, proud baby belly resting where her lap once was. Not too big, average for a woman three trimesters in. Breasts larger and filling her cup.