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Some time later—perhaps ten or twenty minutes, though I had no way to know for sure—a door opened in the wall I could see through my thighs. I hadn't even realized there was a door, until then.

“Good girl, Brianna!” she laughed wickedly as I involuntarily painted myself with my mess. “Cum for Mommy! Cum on Mommy's cock like the obedient little sissy bitch you are! Now what do we say, Brianna? What do we say?” From her tone of voice, I knew just what she expected.

That was when Daddy moved into place behind me, just as I was really getting into it. He grabbed and lifted me by my hips, and I obediently pulled up my knees, holding myself up as he pushed himself into me again. I gasped loudly, and I guess the sudden exhale of breath over Mom's clit must have really felt good, because so did she. Either that, or she was finally coming to grips with the idea of Daddy fucking me, and she just liked getting to see it again. Maybe both, actually; I hoped it was both. Daddy started thrusting, and I wrapped my arms around Mom's thighs, holding tight and securing myself in place so the movement wouldn't make me accidentally hurt her with my teeth. It was so, so much harder than they made it look in porn, trying to concentrate on eating Mom's pussy while I was also getting fucked! But I found I was gradually getting better at it, and by the time Daddy was finally cumming in me again I think I'd managed to give her one for every two that he'd given me. Not as many as I'd hoped, but I think that was pretty good for my first time, and only having my mouth to work with instead of Daddy's miracle cock!