Eep Trying

Mark

"Do you consent to this experimental trial knowing that the effects are permanent?"

"I do"

"Very well, I'll give you the shot now. For the best results, give your wife the shot while she's asleep.

I nodded my head, nervous but excited. My wife and I were casually trying for a baby and while there were no indications of us having fertility issues, I came across a clinical trial to boost libido and sperm production and thought it could be fun. I decided not to tell her about signing us up because the side effects might discourage her. Things like brain fog, changes in taste buds, body aches, minor alterations to your body, etc.

The doctor gave me the shot in my thigh, I watched as the liquid rushed inside of me and swore I could feel a stream of cold travel through my body. I didn't feel different immediately which gave me time to drive home and greet Sarah as if I were just coming home from work.

"Hey hon, how was work?" She gave me a peck as I walked in the door,

"It was good, I'm exhausted though." This wasn't a complete lie but I wanted to go to sleep a little extra tonight.

"Alright well let's eat and head to bed, I'm pretty worn out too" She gave me a soft smile and I couldn't help but pull her in for a deep kiss. After a few seconds she pulled back and gave me a curious look,

"What's that for?"

"Nothin' I just love you so much" She rolled her eyes and pat me on the chest before walking away. "I love you too."

I watched as her ass swayed while she walked and felt my dick stir in my pants.

We ate dinner quickly and I retreated to the bathroom. I hid the shot the doctor gave me for my wife in one of the bathroom drawers. I undressed and stood naked in front of the mirror, seeing if I could notice anything different about my body. Nothing yet, maybe a little swelling in my balls. I shrugged and tried to be patient. As I rubbed soap all over my body, a wall of exhaustion hit me and I even felt a little dizzy. I quickly dried myself and crawled into bed. Before turning to cuddle Sarah, I set a silent alarm for midnight on my phone.

Turns out I didn't even need the alarm because I couldn't stay asleep for more than 30 minutes at a time. Giving up, I decided to listen to the sounds of Sarah's breathing. She was a heavy sleeper and I could tell she was out. Silently I got out of bed and made my way to the bathroom, pulling out the syringe I had hid earlier. Walking around in just my boxers, I was suddenly aware of how tender and swollen my balls felt. Nothing painful, but enough to keep me thinking about them. I grabbed the syringe and went back to the bed. Without giving myself time to second guess, I quickly gave Sarah the shot in her thigh, just as the doctor did to me. She rustled slightly and let out a small moan but didn't wake up. Relieved, I gave her a kiss on the forehead and got back into bed. This time I fully went to sleep, only mildly bothered by the sensitive mounds between my legs.

I awoke a few hours later with a raging hard on. It was unlike anything I had felt before. I felt as though my dick was made of hot steel, throbbing out of my skin. The ache in my balls had grown unbearable now. They felt heavy and stiff. I turned to hug my wife, hoping she'd wake up and put me out of my misery. I ran a hand under her tank top and cupped one of her tits. To my surprise they felt a little fuller and firmer. Immediately her nipple hardened. I teased it between my fingers and her breathing quickened.

"Baby wake up, I can't sleep" I whispered in her ear. Half asleep she pushed her ass into my crouch. "Jesus you're hard" she breathed. The sound of her voice, effortlessly sultry, was enough to make my cock twitch and ooze precum. Without further permission I stripped off her pants and climbed on top of her. She spread her legs wide to accommodate me and I felt how wet she was with the tip of my dick.

"You're so wet for me" I almost didn't recognize my voice. It came out almost like a growl. Sarah blushed, still a little embarrassed when I talked dirty. It only made me more turned on.

"I don't know what's happening to me," she breathed and looked me in the eyes. I saw a hint of fear but also a bit of fire. She was taunting me as if to say 'your move'.

I spread her slit with just my tip and felt her folds squeeze around me. Slowly I pushed in, inch by inch with as much patience as I could muster. With each push, her walls pulsated, impossibly hot. She grabbed my hips and dug into my skin with her nails, my head was spinning.

"You feel so big" she gasped when I reached her hilt. This made my cock soar, I wanted to fuck.

"You're going to take it" I rasped, quickly withdrawing and thrusting into her. I couldn't hold back anymore, I needed to cum. I was normally a gentle, generous lover, but whatever was in that drug turned me rough and selfish. I pumped into her without restraint, ravaging her tight cunt and mauling her nipples. I sucked on her neck as she moaned louder than I had ever heard her. Her little grunts and swears only pushed me to go harder. She arched her back so I could take her nipple into my mouth. It felt swollen and harder than I remember. She writhed beneath me I wasn't going to last very much longer and the smell of her sweet sweat was intoxicating. Sarah usually needed her clit stimulating to cum but I couldn't care less about that now. Plus she seemed to be enjoying my cock anyways.

"Cum in me" She didn't have to tell me, that was already the plan but hearing her words sent me over the edge. I nutted my load into her for what felt like forever. With each spurt of jizz my cock twitched violently. Only once I had stopped did the ache in my balls subside slightly. I pulled out and watched as my semen dripped out of my wife's swollen cunt. Her clit looked red and angry. Watching her pant and come back, something changed in me. I wanted to own her, breed her, control her. Only one word came to my mind, clum slut.

Sarah

When Mark woke me up to fuck I felt hornier than usual. My breasts felt sore and as soon as he reached for my sensitive nipples I was drenched. My body didn't usually respond this fast to his touch but I wasn't complaining. Before Mark had woken me up, my dreams were filled with snippets of sex scenes. Us in the car, us in the shower, me sucking his cock and swallowing his load. He fucked me harder than he ever had before. I loved Mark and appreciated how giving he was as a lover but always wished he would let go of his inhibitions and give in to his more primal wants. As he rammed into me the smell of his musky sweat filled my senses, bringing me to new heights. I felt drunk with lust and felt so incredibly full with his cock I couldn't think of anything else.

As he got closer to cumming, I felt the head of his cock swell into a mushroom. More than anything I wanted to feel him release inside of me. I wanted him to push against my cervix and fill me. I wrapped my legs around him and dug my nails into his back. He gave me what I wanted and nutted deep inside me. The smell of his sweat combined with the feeling of his cock twitching in me drove me mad. My body felt immediately different. I felt connected to him on a cellular level, as if his cum had rewired my brain. I couldn't think of anything else. I replayed the image of his hard cock spewing ropes of cum over and over in my mind, becoming obsessed with the idea of his sperm. I wanted to taste him, to worship him.

As if he could read my mind he moved to kneel over me and pointed his semi erect cock at my lips. His eyes were dark and threatening. He was scary but it turned me on even more.

"Open your mouth" he wasn't asking. I obeyed instantly, not even thinking. His fat balls hung over me and filled my head with his scent.

"Good girl" He traced the head of his cock around my lips and I could taste his cum and my juices on him. I stuck out my tongue and looked him in the eyes. He placed his dick on my tongue and I began to clean the sex off him. His eyes rolled to the back of his head and he grabbed my hair to pull my mouth deeper onto him. Even semi hard he filled me. I used my tongue to diligently wipe every inch of him.

He began to stiffen again and pushed deeper down my throat. Normally I would choke at the intrusion but to my surprise, my throat accommodated his length and thickness without restraint. I found that everytime this manhood touched the back of my throat, I felt a surge of pleasure in my cunt. This was new, as if I had developed a new gspot. As he kept hitting that spot, I got wetter and wetter and hornier and hornier. I was moaning obscenely. He fucked my mouth harder and harder. My nipples felt impossibly hard and I moved a hand to tease them. Mark noticed and pinned both my hands by either side of my head. I whimpered around his cock.

He withdrew and I immediately protested. I wanted more, I wanted to taste him.

"Why-" I began to protest but he stopped me

"Shut up" the harshness of his words surprised me. He positioned me so that my head hung off the edge of the bed and he stood above me, dick in his hands. I never noticed how our bed was the perfect height for this, his cock lining up with my mouth. It was like he could read my mind, and I was practically drooling. He again traced the head around my lips and pushed in, quickly finding that new gspot sending shivers down my body. He was smart for thinking of a position that allowed him even deeper access to my throat.

As he fucked my mouth, he ripped my thin tank top off my chest and I felt his calloused hand reach for my breast. He pinched my nipple hard and I moaned wantonly. Keeping one hand focused on my nipple, he used his other hand to finger my pussy. Feeling how wet I was he swore and began pumping his thick fingers in and out of me. The sensations were overwhelming, his cock pushed on the pleasure center in my throat relentlessly, his fingers teased my nipples, and his other hand was fucking my cunt. I was going to cum and he knew it. He thrust faster and faster, going deep into my gullet each time. He took his fingers out of my sopping cunt and spread our combined juices over my tits, using his semen to tweak each nipple. It was so erotic I felt like a dirty whore. His dirty whore. He then wrapped a hand around my neck and squeezed until I felt starved for air. No doubt the extra pressure felt amazing on his cock.

He began to twitch and throb uncontrollably, and his head swelled into a fat pillow once more. Grunting loudly he shot rope after rope down my throat and I had no choice but to swallow. On the last twitch he pulled out to rest the head against my tongue and I flicked at the opening, lapping up the last drops and savoring his taste. My head was still reeling from the lack of oxygen and I again felt irreversibly changed. I looked Mark in the eyes and felt enamored. The look he gave back was not unkind, but felt determined and lustfull. Whatever these new feelings were were not going away.