Being an excellent Wing-woman

“We shouldn’t.” Jethro said, it seemed like it was almost painful for him to say it.

I pulled away from his cock and swung one leg over his body, “Why not?” I asked, “I’m just helping you get laid by Julie. She wants to know how such a large cock feels inside, if I tell her it feels great…” I rubbed my wet cunt against her cock head.

“You’re not doing this cause you want to help me fuck Julie.” He said.

“Nope.” I replied, “So now that we both have admitted that, you going to put that thing in me? And don’t worry, I’m not wearing my fertile nipple charms today so it’s perfectly safe to fill your little sis with your cum.” He groaned. “Please,” I begged with a big grin.

He groaned again instinctively thrusting upwards. Moved up his body and leant forward before sliding down towards his cock. As he started to nudge me I reached back, parting my lips and positioning his cock head at my entrance.

“Kim we shouldn’t,” he protested again.

“Do I need to provide more of an incentive? More than getting to fuck me, more than getting to fuck Julie?” I asked, he just groaned as I slowly pushed my way down onto him. “Oh that’s nice,” I said as he stretched me out. “How about, when Mark and I get married you can fuck me in my wedding dress?” He lay there as I rocked back and forth taking a little more of his cock.

“Not enough?” I made a show of thinking, “A threesome with me and Julie?” He groaned again and I felt his cock throb. “Or a threesome when one of us is fertile so you can try breeding someone,” this time there was a thrust, “I’ll even let you choose, me or Julie.”

He groaned again and pushed up into me, “You wouldn’t really.” He grunted.

I bit my lip as he pushed more of his cock into me, he was so long it felt great, I couldn’t wait any longer, so I sat up more squatting on my toes. “You are going to bash my cervix with that thing I know it.” I said with a smile as my fluids dripped down his cock. “And sure I would. Would you like to fuck a fertile unprotected cunt?”

He nodded, “I sure would, but you know it would be Julie, we couldn’t risk you getting pregnant from your brother.” As he was finishing I dropped my weight onto his cock, sinking as much as I could into me. I yelped as he bottomed out in my cunt, pushing against my cervix. I bounced on his cock for a little while relishing the sensation of him stretching me out while moaning.

“Take a picture.” I said to Jethro, “Send it to Julie, ask her.”

Jethro picked up the phone with shaking hands and took a snap of his little sister impaled on his huge cock. “What should I say about how it feels?” he asked.

I moaned, “Tell her I feel so full that I feel like I’m pregnant already.” I said, my brother shuddered again. Once that was sent I started to bounce in earnest, squatting on his cock like I was I could ride him up and down with just a little hop of my legs.

After a few moments the phone buzzed again, he picked it up and I watched his eyes widen, “It says, ‘so you told him you want him to knock you up with triplets so they can gangbang you on their eighteenth’.”

I groaned as I rode him, “I hadn’t thought of that. What do you think big bro?”