Laying under the cow Jeff had a sudden urge to turn his ass towards the cow's underbelly. Turning over and on his hands and knees he stuck his ass up at the cow as something crawled out of his ass. A fleshy tube coming from his ass that went up to the cow's belly and connected to it.
The second the tube connected to the cow Jeff felt a warmth coming from the fleshy tube as blood started flowing from the cow and into the tube, and from there into him, slowly replacing his blood with the cow's as a warm liquid started to travel down the tube from the cow and into Jeff.
'Milk.' Jeff thought as he felt the warm liquid enter through his ass tube. Shivering in delight Jeff crawled out from under the cow and stood up in the field right next to the cow, the tube connecting him to the cow allowing him some movement as he stretched his arms and legs, he could move but in the end not very far from his cow. He felt a little sloshy and strange as milk and the cow's blood entered him through his ass tube, he knew that the blood was replacing his own. But where was the milk going?