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“Good boy, Brucie! Good boy!” I encouraged him, ruffling his neck. “Mommy's turn this time!” And with a tongue-lolling doggie grin, he finally made his move, jumping up onto Mom's back and starting to thrust himself at her. She gasped in some combination of surprise, doubt, and fear, and I took her hand in mine, giving her a reassuring squeeze. “Try to get a little lower, if you can,” I advised her. “If you let him get all four paws on the ground he'll be way less likely to scratch you with his claws. It'll feel better, too, if you give him more leverage for thrusting.” She did as I said, lowering her hips and pressing those huge, hanging tits firmly into the carpet, her eyes clenched closed as she waited for it to happen. Bruce was having a little trouble finding his mark, as he always did, so I reached in under her with my other hand and spread her thick, meaty lips with my fingers. That got it done, her eyes popping wide as that hot doggie cock finally slid inside. His claws scratched at the carpet as he tried to reposition himself, giving himself one more deep, forceful drive into her depths.

Such a cute little human you are, doctor, and you've done so well looking after us while we infest this machine. Do you see how hard our clocks have gotten whenever you're near us? Or how our breasts leak this "milk" substance you speak of?

“Okay, sweetie,” she agreed, leaning down to kiss me softly in my hair. “We won't tell him, not until and unless you're absolutely, one hundred percent sure you want him to know. And if you decide you never do, that's okay too. Whatever you want.”