Zoe came in

The door opened, and Sarah came back in. However, Zoe walked in right behind her.

"Huh?? What are you doing here?" I asked instantly, trying to cover myself with a blanket. I was astonished by what I was seeing:

Zoe was completely naked. Her large breasts jiggled at the same rhythm as Sarah's, and although they weren't as huge as my fiancee's, her nipples were a bit larger. Her legs were also beautiful to look at, much better than I had imagined. However, there were two big changes in her appearance:

One, her expression was completely different. Her striking big blue eyes behind her round glasses were confident, powerful, decided. She didn't look shy at all anymore, and I felt a little frightened of her gaze somehow. And two, between her thick, juicy thighs, there was a cock. It was as big as mine, and much thicker.

Sarah, on the other hand, had put on the choker Zoe had given her last week, the one with the S.

Zoe walked to the border of the bed, and after lovingly caressing Sarah's face, she had her kneel down in front of her, and my fiancee started stroking her cock.

"Sarah?? What is going on??" I stuttered.

"I'm sorry, Liam" Zoe started. Her voice was still soft, but somehow felt more intense and serious. "We can't keep this from you anymore. This is the extra muscle that my sweet Sarah has been massaging. Your girlfriend has been dedicating her body and soul to me. You see?"

Sarah was gazing at Zoe's cock like someone who's in love. And soon she put the dick in her mouth and started sucking. She blew her like an expert, but she was even more dedicated than with me, and even moaned loudly, enjoying every inch of her. She deepthroated her, then took her out of her mouth. Oh, my god! Now that she was fully hard, I could see Zoe was huge! At least double my size, around 10 inches!!

"Do you like my cock, baby?" Zoe asked. Her eyes were fixated on me, watching my reaction, while her hand caressed Sarah's red hair.

"I love it, baby." Sarah said with the most lustful voice I've ever heard.

"Let's show your boyfriend how much you love futacock."

"Yes, baby."

Sarah climbed onto the bed, right across from me. She arched her back in the sexiest way possible, presenting her ass and pussy to Zoe. I could see her large boobs dangling beautifully from her torso. They were so big her nipples almost touched the bed. She looked at me in the eye, and I could feel her arousal in them. I felt an involuntary twitch in my cock.

"I... I don't understand what's going on..." I managed to utter.

"You see, Liam. The little S on the choker doesn't stand for Sarah, but for Slut. I marked her as mine long ago, but you only saw it recently. But don't worry. You'll see it live now."

She was fondling Sarah's ass with a hand while with the other she directed her huge cock to my fiancee's pussy. With only the touch of her hot, hard glans, Sarah sighed.

Then Zoe pushed. Sarah let out a very loud moan, and her expression changed to such bliss and pure ecstasy I had never seed before. A slow but rhythmic, wet sound started to fill the bedroom.

"Come on, baby. Tell your boyfriend how much you like it."

"Oh, I love it!! Liam!" I could tell it was hard for Sarah to focus on me. Her huge breasts were swinging to the pace dictated by Zoe's deep, slow thrusts. "I'm sorry, Liam! I... Ah, yes!! I love you, I really do! But I love futa cock so, so much more!!"

"B-but..." I uttered. I couldn't believe my eyes. And I couldn't believe my dick was getting hard!

"Did you feel like this when you rode Liam, baby?" Zoe teased.

"No, absolutely not!" Sarah replied, once again looking at me in the eye. She was blushing so hard her cheeks were almost as red as her hair. "Liam, I'm sorry! But your cock isn't nearly as big as Zoe's! I'm...! Fuck, yes, baby!! I'm about to...!"

"Liam, please watch carefully as I make your girlfriend... No, your fiancee cum." Zoe said. She seemed to move effortlessly, but her thick hips were already hammering Sarah with immense ****, making her boobs swing wildly. "Sarah, baby, let him see the pretty face you make when you orgasm!"

Sarah reached climax, and she screamed in pleasure. There wasn't anything in her gaze that wasn't pleasure. Not even in porn had I seen such a lewd face, and even then, porn actresses were always faking. This one... Just some feet away from me... Looked so real. Sarah looked like Sarah and like a totally different person. And as she climaxed, it hit me.

They'd been doing it. All this time. Every kiss. Every touch. Every massage. Every shower. Every exercise! Fuck! I'd even helped them while they fucked! How could I have been so dumb? So gullible? I was blinded by Sarah's happiness for having friends. Girlfriends. She was always in such a good mood I didn't care about anything else.

"She does love you" Zoe said. Her soft voice felt... Mocking. "But that love isn't as strong as her love for me. I've been paying for everything for that reason. I've been having so much fun with your girl. I've made her cum so many times. I've filled her with buckets of semen. Oh, that semen you love on your pancakes so much. She loves it too."

I felt like throwing up. No, I wanted to feel like that, but I was clearly not the owner of my thoughts at the moment. Zoe was. And she was giving me an erection against my will.

"She loves cucking you so much I even shared her with some girlfriends." Zoe kept going, not only with her speech, but with the thrusts of her wide hips. The sound was even wetter now, and it was evident Sarah was dripping pussy juice now. "You should have received something on your phone."

I was still stunned at the scene, but I could muster some energy and stretch my hand towards the bedside table to get my phone. I had a message from Monica, and several files.

Monica » Hey, Liam! Zoe told me to show you these. Hope you like them! Tell Sarah I said hello! My cock misses her ❤️

Then there were tons of pictures: A selfie from Monica where Sarah is knelt in front of her and sucking her futa cock. Sarah smiling at the camera with two long, thick cocks oozing precum pressed against her face. A futanari girl I didn't know fucking her from behind. A other futa doing the missionary with her. Another one where Sarah is riding a futa. Another one where she's riding two futas who are double-penetrating her. There were dozens and dozens of photos of her and several different futanari ladies having sex, and she seemed to be enjoying it so much.

There was also a video: Sarah is kneeling, and a small group of futas are jerking off around her. Of course, she's helping them with energetic hand jobs. She's completely covered with the thickest semen ropes I've ever seen: her hair, her face, her huge boobs, everything is a pearly-white, slimy mess.

"Tell your boyfriend something" Said a voice from the video. It was Zoe.

Sarah could barely utter anything, as she was so focused on the futacocks.

"I... I love futas so much... I love their jizz... Their milk is the most delicious, I want it all..." She mumbled. Then the two girls she was masturbating came, and they shot their loads onto her. Goodness! They came buckets! The shot really long, thick ropes of semen on top of her, but she also opened her mouth to take a large amount of semen. She tasted it for a second, then she swallowed effortlessly. She was so delighted by that.

"We have fed her so much cum" Real life Zoe told me as she pounded on my fiancee really hard. "We futanari ejaculate so much more than a man, and our seed is so much sweeter. Sarah is completely addicted to it. Aren't you, baby?"

"Yeeees!!! I want it all, please!!" Sarah begged. Her face was already against the bed, and she was doing a big effort to keep her ass up for Zoe.

"I'm about to fill your fiancee with my huge load, Liam." Zoe said "And I know you're loving it. Don't try to hide that 5-inch cock anymore. So you have two options. One, accept it and live this life with us, have Sarah as your wife, but enjoy getting cucked all the time. I'll take her whenever, however and wherever I desire, as she'll be mine in reality. You can watch, you can listen, you can know about us, all of us fucking your soon-to-be wife, and you can be happy as a cuckold. And Sarah will be happy as a slut hotwife for futas. Or two, reject it all. Leave. I'll take your fiancee as mine, as she will never leave her life now. Oh, this pussy is so good! Liam, you have to decide before I fill her with jizz!"

Her pounding was so intense I thought she might be part machine. Her hips hammered against Sarah's, and her big cock was drilling inside her so fast and so hard, making her moan like never before.

"P-please!" Sarah said as she reached towards me with a trembling hand. "L-let me love you like this!!! Aaah! I'm about to cum again!!"

I was overwhelmed. I knew I liked the idea of Zoe and Sarah being together. They had made me so familiar to their lifestyle I had taken it as my own. But then again... That's my girlfriend, my fiancee, getting railed so good, and enjoying it immensely. I... I didn't know what to do...