Inseminate her

In 5 minutes it was full. I had pulled 10 pints from her tits and they didn't even look much smaller! I got up and moved the basin. Mrs Russo turned and followed me with her cow-head as I carefully transported her milk up to the kitchen table then returned, but this time approached her from the rear, clicking my fingers. My erection doubled in size from 6 inches to 12, then doubled again to 2 foot long and similarly thicker. I bumped my chin on it briefly and considered that I could probably give myself a blowjob now if I wanted. However that wasn't necessary as I positioned myself at the rump of Old Mrs Russo and jammed the whole length inside her.

As well as her external features i had grown the size of her reproductive organs to a similar scale to mine. I grabbed her around the waist and thrust into her as hard and fast as I could.

"Mooo!" she craned her head round to look at me jackhammering into her from behind. Her eyes looked large but dull and she appeared to be chewing the cud.

Eventually I came inside her in huge quantities, so much so that even her enhanced cavity was overflowing and a lot of cum ended up on her living room linoleum.

Withdrawing, I could see the horns shrink and disappear and the black patches too.

Mrs Russo stood up, herself once more and her tits having lost 10 pints of milk were down to merely fucking enormous.

"How...?" she started.

"You will turn into the cow every day, Mrs Russo, round about this time once your full of milk. If you get inseminated and milked you will turn back to your normal 25 year old self."

She stood up and flexed her pain free joints, swivelled her neck then looked at her massive tits.

"Its either that or I can put you back to 85. Its up to you?"

"uh-uh.", she said, she felt her supple wrists "I'm not a miserable old cow any more. i'm just a cow!" she smiled. "Moooo. Moooo!"