Luckily the love bite that Brooke gave me faded fairly quickly and I managed to hide it from Charlotte. Charlotte still seemed none the wiser about the fact that her fiancé was effectively having an affair with her sister.
We were all sat in the living room one night, Charlotte and I on the long, grey sofa as Brooke sat in the large armchair to the side. She was wearing black leggings and a white t-shirt. Most of her shirt was baggy but even still she wasn't able to hide her big tits underneath it. What's worse was that she clearly wasn't wearing a bra and her hard nipples were poking through.
Over and over I caught myself looking over at her, knowing what she looked like underneath.
Charlotte was watching some girly TV show when my phone buzzed in my pocket. I grabbed it and my eyes shot wide when I saw Brooke's name appear. I looked over at her but her head was down and looking at her own phone, although I could see a smirk on her face.
I turned slightly to the side so as not to raise too much suspicion as I opened her text.
Brooke
: I wish I was sitting on your face right now!
Before I even attempted to reply another message came through.
Brooke
: I'd ride your tongue like a cock until you made me cum! All while I was grabbing my tits and moaning.
My cock started to stir in my shorts and I knew I had to quickly do something about it, just as another text came through.
Brooke
: Do you like staring at my nipples through this shirt? You've practically been drooling at me.
I put my phone down for a second as I shifted, allowing my cock to move between my waistband. I looked at Charlotte who hadn't noticed and I automatically replied to Brooke.
George
: I can't believe you're texting me like this with Charlotte here!
Brooke looked up and smiled before going back to her phone, her long, blonde hair flicking as she moved.
Brooke
: Remember when you got to watch me grabbing her small tits, I bet you loved that. Watching your fiance's sister playing with her tits!
Less than 5 seconds later another text came through.
Brooke
: In fifteen minutes we're going upstairs and you're cumming over my tits.
The absolute arrogance of this young girl was shocking, even for me, and I've fucked a few sluts in my day but none like Brooke.
George
: No, that's way too risky.
Even as I hit send my cock twitched.
Brooke
: I think we established that you don't have a say after last time. I'm going to pretend to go to bed, you meet me in my room. Do not take long.
George
: No Brooke. That's too far.
Brooke
: Like you'll be able to resist the fact that your cock will be down my throat in a few minutes as I finger myself yet again for you.
"Who are you texting so much?" Charlotte's voice asked.
My body tensed as I gripped the phone in my hands.
"Just my mates." I nervously replied.
I had to fight the urge to shove my phone into my pocket, knowing that would just make me seem even more guilty.
When I looked at Charlotte I could see she was thinking to herself, probably wondering if I was telling the truth. Other than what had been going on with Brooke I had been the most loyal partner in the world, so I knew she had no reason to question me.
But as I was thinking that Charlotte put her phone down and moved so her head was lay on my lap. Her feet were up on the sofa as she lay sideways to watch TV.
I jumped slightly by accident and felt my hard cock tap at the back of her head. She slowly moved her head so the corner of her eyes could see me and she smiled.
I knew what she was thinking, she was excited that I had my hard cock against her with her own sister in the room. Charlotte must've thought it was some exciting act. If only she knew I was hard because of her sister.
Charlotte's left hand then landed on my thigh and held onto me, her medium-length, brunette hair on my body as she cuddled into me.
When she went back to watching the TV, her head still pressed against my cock, I turned and saw Brooke giving me a dirty look. Her pale cheeks actually had turned red with anger.
For ten minutes I was sweating and panicking that she would text me again. There would be no way that Charlotte wouldn't feel that.
Luckily for me, she didn't and after a few minutes, she stood up. Her big tits bounced as she did so.
"I'm going to bed." She said bluntly.
"Night," Charlotte replied quietly.
As she walked towards the door she turned and I looked at her, Charlotte still looking away, and she nodded upstairs.
I shook my head and mouthed the word "No." but she gave me an even more annoyed look and pointed upstairs.
After that she left, I got a good look at her big arse that was hugged perfectly by her leggings.
It took only a minute or two after she left that Charlotte pressed her head against my cock harder.
"Naughty, having this while she's in the room." Charlotte playfully whispered.
Instantly I had flashbacks of when we had sex on this sofa and Charlotte was moaning Brooke's name.
Before I could react Charlotte turned around, her head still on my lap as her right hand grabbed my hard cock from the outside of my shorts.
"What are you doing?" I whispered.
"Well he's here for a reason, right?" Charlotte whispered back as she rubbed my cock with just my shorts in the way.
"Chalotte..." I moaned back but she cut me off.
"Or was it because Brooke had her big tits out again?" She asked and surprised me, but carried on rubbing my cock, "Did staring at my little, slut, sister's tits turn you on again?"
I had no idea what to say. Should I agree and hope it turned her on, or would that just ruin everything? No, the smart move was to remain quiet.
"And her big ass in those tight leggings," Charlotte whispered, "I bet you wish she bent over or something in front of you."
"Oooh god." I moaned.
"I knew it," Charlotte replied, her hand never left my cock, "She dresses like such a slut, how could you not find it hot. That hot body just teasing you. Luckily I won't tease you."
Her hand then went to go inside of my shorts but as she did my phone vibrated.
I just saw Brooke's name pop up on the screen and I jumped up, nearly throwing Charlotte onto the floor.
"Two secs." I said.
"What? Where are you going?" She asked me, obviously surprised that I stopped her as she was reaching for my cock.
"I just need the bathroom," I told her.
Charlotte looked up at me with her mouth hung open in shock.
"Seriously? I throw myself at you and you're going to the toilet?" She asked me.
"I really need to go," I said and then leaned down with a smile and kissed her, "but don't worry, I'll be back and give you what you want."
"What you want more like," Charlotte said with a playful smile which meant I had gotten away with it.
I rushed out and headed upstairs. When I reached the top of the stairs I made sure to move quietly so Charlotte wouldn't hear which room I was going into.
Surely Brooke wouldn't be so insane to try and do something when I explain that Charlotte is waiting for me downstairs, right?
Then I opened her door and saw the beautiful 18 year old on her bed, completely naked, legs spread wide open and a purple dildo deep inside of her wet pussy.
Every single thought in my head disappeared as I saw her.
Her big tits slightly jiggling as she slowly moved the dildo in and out of her. Her chest moved up and down. Light gasps left her thick, soft lips.
"About time." She whispered.
Fortunately, my thoughts came back to me, even if my cock remained solid.
"Brooke," I whispered and silently closed the door, "Charlotte is waiting downstairs, we can't."
I watched as she slowly pulled the juicy dildo from her pussy and threw it to the floor. Then she stood up, my eyes roamed all over her small, curvy, perfect body.
"I don't care," She told me, "Think you can cuddle with her in front of me and not expect punishment."
Even as she walked over to me I wasn't able to move.
"She will expect me back any second," I told her like that was a way to justify it.
"She wants you to fuck her doesn't she?" Brooke asked.
I gulped and nodded.
"I knew it, she can't stand having you look at me that she has to throw herself at you," Brooke said with an actual laugh, "Shame she isn't enough for you."
Her right hand was gently grazing up and down my right arm, every hair on my body standing on its edge.
Then, Brooke grabbed me and threw me onto the bed. I lay there and just watched as she straddled me. Her bare, wet pussy pressed against my hard cock that was still hidden by my shorts.
"You'll just have to make me cum quickly with your cock then." She told me.
Her left hand was pressing my chest down to stop me from moving as her right hand reached to pull out my cock.
I say she held me down. This girl was half my size. If I really wanted to then I could've easily pushed her away. But I didn't.
In my head, I still argued that she was making me do this. That she was still holding something over me, that I wasn't completely complicit.
Then when I felt the head of my cock being wrapped by her tight, soaked, smooth pussy I let out a deep moan.
"Oooh Brooke." I panted.
I looked down and watched her pussy lips spread apart as she slid herself further and further down my shaft. In a matter of seconds, she had me balls deep inside of her and my cock felt like it was in a tight, wet glove.
"Good thing I was close to cumming as I was waiting for you." Brooke moaned out as she started to ride my cock.
I lay there for a moment, watching this hot, slutty young woman ride my cock slowly. Her tits bounced in front of me as the most perfect cunt in the world rose and sat down on my cock.
Suddenly she grabbed my right hand and pulled it towards her clit.