Cas awoke on top of Dean, the sun streaming through the small crack in the curtains.
Cas pawed lazily at Deans bare chest, his wide yawn showing his sharp, pointy teeth. Dean stirred beneath him, his arm cupped around Cas he stroked his fur lightly.

Cas began purring heavily under Deans touch, this made Dean spring up like a new born lamb.
Encouraged by Deans reaction, Cas' paws reached down to the band of Dean's tight fitting boxers, as he tore them down in one swift move.
'Mmmm...' Dean mumbled with pleasure, getting a soft 'mew' in reply.

Cas felt Dean's heart race as his rough tongue found Deans weapon. He scrapped his teeth along Dean's bulging third leg, while kneading at his shaft repeatedly.

Dean gripped the sheets tightly and exhale sharply.
Cas ran his hairy tongue along the length of Deans dangler, and then heard a muffled moan. Cas purred and kept licking.
'Fuck, oh Cas...' Dean gasped.
Cas meowed in return, kneading Deans balls while continuously licking his extending member.
Dean quickly became a quivering mess under Cas' touch, his expert touch, after all he's been licking his own cock and balls for years now.
It wasn't long until Dean was squirting like a squashed fruit, which Cas happily licked up.

He loved his warm morning milk.

Cas set to work on licking his fur, as Dean gazed at him. He wished he could communicate with Cas fo' real. But love knows no bounds.
Cas jerked up, bouncing off the bed. He arched his back and began dry gagging. Furball, Dean guessed. A small lump of sick landed on the carpet as Cas looked to Dean apologetically before running into the bathroom.
He circled the toilet for a while before he was confident it was safe.

This had been happening more and more regularly.

Cas spied the cabinet was slightly open as he jumped in.
He knew where the tests where. What he didn't know was why Dean had them, probably from his previous lovers.
Cas picked the package up between his teeth, and settled beside the sink. He tore the packaging off all at once and jumped back on the toilet.
After, he lay the test out on the ground. 5 minutes. 70 tail wags away.
The future lay in the next 5 minutes.

He grabbed the test once more between his teeth as a muffled meow of panic escaped his mouth. He rushed with the test to Dean, who was arriving back into the bedroom.
'Hey, I made you breakfast, fish cakes...' Dean was cut mid sentence as the test reading positive fell from Cas' mouth.
'Shit, how will I explain this to the vet. Fuck.'