It's been a few weeks since Judy and Nick got married. They decided they want to have a baby, but have had trouble conceiving. Not for lack of trying. Her pussy received Nick's cum almost everyday. But none of his little swimmers seemed able to take root. That is, until one day when her doctor gave her a new fertility-boosting formula. She was given an explanation for how it worked and a schedule for when to take it. After a few days, she felt the change. Her breasts grew bigger and more sensitive and she felt quite horny for almost the entire day. She arrived home, anxious to see if the formula worked in all the ways it was intended to.

She knocked on the door to their bedroom.

Judy: Nick! You there?

Nick: I'm here, honey. Bit tired, though.

She peeked her head over the door.

Judy: I hope you're not too tired. I have a surprise for you.

Nick: What kind of surprise?

Judy: Let's just say it's one that you will... enjoy... greatly. Now close your eyes.

And so he did. Judy walked over to him and placed the nipple of one of big breasts in his mouth. A bit of milk was already leaking out of it. Nick opened his eyes, a look of surprise on his face and started drinking from it.

Nick: Oh, wow, Carrots! I was expecting fishnets or something. I'm guessing these aren't regular implants.

Judy: It's a new treatment. Should help us with our bedroom issues. Or rather the end results. I was told my fluids would also affect you as well. This should help us have a baby. So what do you say? Wanna plant your seed, my love?

Nick: Mmm-hmm!

Nick said this while still gulping milk her big breasts. Meanwhile, Judy unzipped his pants and took his cock in her hands and starting gently stroking it. Nick alternated between sucking each breast. The increased sensitivity in her breasts made the breast-feeding particularly enjoyable for her. She then started noticing that Nick was growing fatter. She took her breast out of his mouth and stood up so she could admire his new form. He was almost as big as ClawHauser, which she found attractive. When it came to men, what turned her on were extremes. Either very muscular or very fat. She found his new form very desirable.

Nick: Woah! What just happened to me? This is... something else.

Judy: I've been told all the effects are temporary. We'll be back to normal by tomorrow. But let me just say: You look very sexy, honey!

Nick: Really?

After saying this, Judy climbed on top of him and lay on his big belly. She was even even smaller than usual when compared to his increased size. She hugged and lightly pinched his belly. He hugged her back. She loved cuddling with him like this. She then gave him a deep, passionate kiss.

Judy: I think it's time for Phase 2.
Judy went over to his erect cock and gave it a short kiss. She then lightly rubbed her right nipple up and down it length, milk leaking on to it. She then grabbed both nipples and squeezed, completely covering his cock in milk. She then wrapped her breasts around his wet cock and moved them up and down. Nick was moaning in pleasure as she did this.

Nick: Oh… That is so fuckin’ hot.
Judy: Mmmm-hmmm… The doc said my fluid will make your cock change and it will help with… reproduction. She was referring to my pussy juice, but I have a kinkier idea. I know how much you love my nipples teasing your glans.
She then rubbed a nipple over the head of his cock, milk still leaking. Then she grabbed his cock and inserted that nipple into his urethra and squeezed her breast. A large volume of milk flowed directly into his cock, going deep inside. He felt his balls get tingly. Her milk was filling them up along with prostate. His cock and balls then started growing rapidly and grew almost twice their previous size. Most of the milk he had received there was being “converted” into cum with a thinner consistency. She then sucked on his glans and tasted a bit of her milk, mixed with a bit of his pre-cum.
Judy: Wow! Looks intimidating, but I think I can get this big boy inside me.
She then lay next to Nick and spread her pussy open.
Judy: Come on! I wanna feel your weight while you fuck me.
Nick got up, got on his knees and positioned his cock at so it was at the entrance to her pussy. Its increased girth meant getting it inside was difficult at first, but her wetness and the milk still on his member made things easier and after a few thrusts, her pussy stretched to better accommodate, likely helped by the formula. While he was pumping into her, she could the weight of his big belly on her. She felt it moving with each thrust. She hugged and caressed it as he was thrusting, then her hands moved along his ass, back, arms and face. His size and her increased sensitivity ensured she orgasmed twice before he did and squirting a lot more than usual. Eventually, hearing the intensity of his panting, she could tell he was close. She grabbed his face, pulled it towards her and gave him a deep, passionate kiss, their tongues “jousting” each other. The torrents of his cum completely flooded her pussy and large amounts escaped it. They continued kissing after he was done cumming and continued until they both felt the growth that was happening to Judy’s body. She grew even fatter than he did. All of this while he was still on top of her. They then lay next to each other for a while, amazed at the changes they went through. But also delighted.

Judy: Ready for another go, baby?
Nick: Oh yeah! You better believe it.
Judy then proceeded to climb on top of him, pointed his cock towards her pussy and slid down on it. Their big bellies rubbed against each other as she bounced on him. His cock soon started hitting her cervix.
Judy: Deeper!
Nick: I don’t think I can go any deeper, babe.
Judy: Before tonight, I believed a lot of things couldn’t be done. Let’s experiment.
With that, she relaxed her legs and let gravity take over. Nick tried to push deeper, but her cervix remained closed. Just as he was considering giving up, the cervix suddenly loosened just enough for his manhood to enter deeper within. He was now balls-deep inside her, his cock having entered her womb.
Judy: So deep! It’s inside my uterus!
Nick: Oh! Oh, wow! This is amazing!
Now his cock was being squeezed on two fronts. The ring that formed the opening to her uterus squeezed the tightest, and the rest of her birth canal squeezed the remainder of his member’s length. The tightness was incredible. This was by far the best sex he had in his life. Judy was having a wonderful time as well. As they fucked like this, she squirted several times. Eventually, Nick ejaculated. The volume of cum was even more than before and this time, far less jizz escaped from her. Her uterus was filled up completely with sperm, so much so that it actually stretched to accommodate the huge amount shooting into it. This was reflected in her belly as well, which also grew bigger. The torrent eventually stopped, and they both stood as they were, their eyes closed, panting heavily and in a state of complete bliss. She then lay beside him, his cock still in her uterus.