I suggest you read parts 1 and 2, but it's not necessary.
I dropped to the floor, wrapping one arm around Sondra's shoulders and pulling her down with me. I rolled on top of her, my legs pinning her hips. I could see the hunger in her eyes as I smirked.
"So, you say your breasts are sensitive?"
I slid down and started licking her tits once more.
"What? Baby ... what are you ... oh fuck."
I lapped up my cum and her sweat, swallowing it all. I sucked at the nipples until she was crying out again, begging me to let her cum. My hands and tongue and teeth making love to every inch of her breasts.
My cock was already rock hard again. "I love tasting you, Sondra. Now I want to fuck you. I want to drag my cock against your clit and feel your cunt flexing as you cum. Oh, baby, let me fuck you."
The dirty talk did the trick. Her body writhing as she screamed, Sondra clutched me in her arms. I cradled her tightly, feeling her body shake against me.
But her noises had changed. The excited cries and hoarse breathing had given way to a soft sobbing. I turned her face to look at me.
"Sondra, why are you crying? What's wrong, baby?"
She sniffled before finding her voice. "I want to fuck you. I want to feel that big cock inside me, but I can't. I promised."
"You promised? You promised who, your husband? Tom is far away. He left you here alone. He never has to know."
She shook her head. "It's too late for that."
Her arm flailed upwards, pointing to the table where the laptop screen was open, now facing us. On it was Tom; sitting far enough back that I could see he was naked on a hotel room bed. Several wadded tissues were scattered on the sheets around his pale butt.
"Hello, my friend. And thank you. Sondra, you were wonderful."
She wiped her tears. "Was I?"
"Were you? Damn, baby. He was so hot for you that he stood there fucking your fantastic tits! He was so horny that he drank his stinking cum right off your chest. Sondra, you are the best wife a man could ask for."
"Am I, really?"
"You don't need me to tell you that. Watch the recording. Or better yet, I can be home in 20 minutes and we'll watch it together."
I blinked as his words started to sink in. "20 minutes?"
"Oh, yeah. There was no business trip. I'm at a cheapo motel in Wolf Creek."
I had to ask. "But if you wanted this kind of three-way, why not just ask me? Did you think I was so narrow-minded? So prudish? Even after talking to the other Dallas School Girls?"
"That was Sondra's idea."
Sondra was still sitting on the floor. Her hair was stuck all across her face. Her breasts were bright red with the beginnings of tiny bruises dotted about. Her legs were spread, ignobly exposing her dripping cunt.