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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.

“No?” She asked, clearly surprised. “Okay sweetie, I won't, if that's what you want. But do you mind if I ask why? We could not tell him about you and Brucie, if you're afraid how he would react... though I'm sure he'd get over it quickly, once he saw how hot you are, doing it! But you have to know he wouldn't have a problem with you and Daddy, not after everything he's been doing to me all these years! Even if you don't want to do anything with him yourself, I know how much he would love getting to watch, if you'd let him.”

“Uh, okay,” I said, dropping my flaccid cock into my underwear and fastening my pants. I was fucked pretty stupid, but I started mopping my cum from her back with the tissues.“You do that again and I am going to make you lick it up.”