I knew Mark was cheating on my sister, I just knew it. He had been avoiding her constantly and 'working late' almost every night. My sister couldn't see through it but I could, clear as day.
I'd never spent much time around Mark though and he knew I distrusted him so I didn't have much knowledge on his normal habits. But I had something that he didn't know about:
Bimbex Ultrastrength
I'd coaxed my girlfriend into taking a couple pills of it a while back to spice up our relationship. She hadn't been too happy about taking it but she did anyway. I don't think she regretted it. That shit works wonders.
So, with Bimbex in my arsenal, I formed my plan to catch Mark in the act. I'd give my girlfriend a pill or two so he wouldn't recognise her and then when he tried to make a move on her, I'd catch him. With my girlfriend recording the entire thing.
It was quite a shock then when my girlfriend said I should take the Bimbex instead. We argued over it for hours but she eventually stormed out shouting about how I should know how it feels before making her take it.
When I awoke the next morning and was greeted with two pert breasts, I instantly knew what happened.
I grabbed whatever of my girlfriend's clothes I could find and stormed over to her apartment. It was so embarrassing walking down the street, my breasts bouncing, ass jiggling and ill-fitting clothes showing off far more than I wanted.
When I arrived at her apartment, I realised I'd left my keys at my house. I turned around to head back only for my girlfriend to open the door behind me.
"Oh hey! I was wondering when you'd show yourself! Come on in!." She opened the door fully and gestured me to follow her. She seemed unusually chipper.
"So, how're finding it? Having such big jugs," she grabbed my tits, I bit my lip to stifle a moan,"and such a perfect ass!" She smacked it hard, a small sound escaped my lips as I felt the fat keep wobbling and jiggling. I looked back, there was a red mark on my asscheek where she'd smacked it.
"You're unusually quiet, are you not gonna shout and scream at me?" She smirked.
"I..." I tried to speak but my rage and fury had dissipated entirely. "I c-can't believe you!" I tried to sound angry anyway, but she wasn't convinced.
"Now I see you want to be mad at me, but I think you're really mad at yourself. A curvy woman such as yourself needs some fitting clothes!" I looked down, only now realising how terribly my clothes fit me. "Let's get you out of those panties and into something much more comfortable!"
I began taking off my shirt and skirt, it took me a couple minutes to pull them over my bust and butt. Despite my difficulty in putting it on, the bra was the easiest thing to take off. The relief I felt in my tits was incredible as I let them hang free, showing off how perky they truly were.
When it came to my panties, my girlfriend giggled as I slid them over my ass and down my legs. They got stuck for a moment as they stayed flush with my pussy, my juices holding them together. I quickly covered it in embarrassment.
My girlfriend then brought out sets of matching bras and panties. She picked out the largest one of pushed the cups of the bra against my tits, the cool fabric felt wonderful. I pulled up my panties and let them lie flush with my flat crotch.
"Wow, you do look wonderful with those on." She was right, I looked great. In fact, I looked incredible. I looked hot, sexy, fuckable.
"You know, did you ever wonder why I didn't protest after I took the bimbex a while back?" I turned back to look at her, my breasts jiggling slightly.
"It's cause you ordered one of the specialised versions. You ordered the submissive variant." I shuddered, submissive? Is that what she'd given me?
"It does a bit more than just make you submissive though. That's why it's recommended mostly for prostitutes." I took a step back, causing my ass to slide against the wall.
"I know you're confused right now, but don't worry. I think someone's just arrived who'll clear all this up." I turned to look at the door, someone was opening it.
"I didn't mean for you to find out this way, but your plan to catch Mark cheating by using bimbex was too good to pass up on. Come on in, honey." I looked in horror as Mark walked into the room and then moved to kiss my girlfriend.
"This her?" Mark asked, I didn't notice just how deep and powerful his voice was until now.
"Yep, but remember our deal. You get one night with her then you kick her to the curb. She'll be back to normal by tomorrow afternoon so make sure to give her the rest of the bimbex, then I'll kick her to the curb." She said, kissing Mark again on the cheek and walking out of the apartment.
He then turned his gaze in me and approached me. I pushed myself back against the wall. He put a hand on my neck and lifted it up slightly, he moved in and started kissing my neck.
He put a hand behind my back and pulled me forward, my breasts flattening against his chest. He placed a hand on my tit and began squeezing. I bit my lip as I felt a moan welling within my throat.
"Fuck, your tits are amazing." He said, pulling away from my neck and placing his other hand on my breasts. He moved them to my nipples, visible through the thick fabric. He squeezed the mounds and I moaned in response.
"You like that don't you?" I slowly nodded in response.
He pulled down my bra, exposing my tits to the cool air of the room. He pushed me onto the couch and lay on top of me, firmly grabbing my breasts.
He slipped my panties off and revealed his cock. It was so fucking big. My only thoughts were that I needed to fuck this cock. I needed to feel it inside me. I needed to know what it tasted like. He saw my resistance melt away and began thrusting. My moans growing in volume and arousal each time.
I shouted for him to cum in me, to make me his bitch. He grabbed my ass and smacked it firmly. He pulled me up until I was on top of him, riding his giant fucking cock. I began bouncing, holy shit it was so deep in my pussy. He moaned and I only quickened my pace.
I could feel his cock twitching in me but he pushed me off. I tried to get back on only to met by a firm hand on the back of my head and a hard cock in front of my mouth. My eyes lit up as he shoved his dick into my mouth. Small spurts of precum erupted from his dick as I sucked hard.
I lost track of how long we fucked that night. I was completely exhausted, panting. I wasn't able to stop Mark when he opened my mouth and dropped some pills in. Fuck they were amazing.
My breasts, mouth, lips and pussy were all coated with Mark's delicious seed. I slipped a hand along my breasts and created a small puddle of cum in my hand, I lifted it over my mouth and let it drip onto my tongue. Fuck it tasted good. I moved about on the couch, suddenly overcome with drowsiness. I drifted off shortly after.
I don't know how long I was asleep but when I awoke Mark was gone and the cum around my mouth had hardened. I stood up, my curves jiggling about, and walked over to the door. My girlfriend was there. She quickly pushed me out the door and said goodbye. I stood astounded, not to mention completely naked. Turning round, I saw a few doors to other apartments. I secretly hoped one of her male neighbours would open their door to see my cum-covered tits.
I slowly made my way over to the first door I saw, being careful not to drip any leftover cum on the ground, I didn't want to waste it. I knocked on the door, a muscular man opened it. I tried to explain my situation but I was too distracted by a quickly growing bulge in his pants. I turned round and made sure my girlfriend wasn't looking before I pushed my body against the man and pushed into his apartment, slamming the door behind me.
I hope this never fucking ends!