I grabbed my sister Sheila as she walked by where I was sitting and pulled her onto my lap. It was purely an impulsive move... or maybe not. I'd been obsessing about Sheila and my other sister Vanessa for a while. My name is Eric and I'm 16 years old. If you read "Barb-a-que" you know how I lost my virginity and acquired two lovers in one eventful day. That was almost a year ago. One lover was my own mother and the other was a friend of hers, Mrs. Alice Perry. I knocked up both women. Alice has already given birth to my daughter, Erica. It took a while longer to knock up my mom but her belly is now beginning to swell as a result of my efforts. My fantasy is to do the same thing to my two married sisters.

"What are you doing? Let go of me," Sheila demanded. I ignored her and prevented her from moving off my lap by wrapping my arm around her waist. "Mom, Eric's being a brat." Our mom had just walked out of the kitchen and placed a casserole dish on the dining room table.

"Get off his lap then," Mom replied before disappearing back into the kitchen.

"I'm not--," Sheila started to protest but when she lost her audience she tried to wiggle away again. I had a nice boner going by then and she couldn't help but feel it on the back of her thigh. "What do you think you're doing?"

"I'm having a nice feel," I said and placed my free hand on her upper thigh and began to caress it. Unfortunately, my sister was wearing jeans.

"Don't," Sheila said and made a futile effort to move my hand away. "I'm gonna slap your face in about two seconds," she warned.

"Don't be that way," I said as if she was being completely unreasonable. I decided to be up front about what I wanted. "Why don't we go upstairs to my room and fuck?" There was no sense in beating around the bush about it. At least Sheila now knew my intentions.

"What!" Sheila gasped. "You twerp! I'm your sister."

"So what?" I said. I moved my hand to the top of her thighs and caressed her snatch through the fabric of her jeans to let her know I was serious. She gasped again.

"Stop it," Sheila whined. "I'm gonna tell Robert what you said." Robert is her husband. He's a middle management type and is on the road quite often. Sheila doesn't like to stay in their apartment alone so she stays with us a lot. My sister is 21 years old and has been married for a couple of years.

"Think about it at least, okay?" I offered. "I'll ask you again later."

"I'll think about it," Sheila promised. I didn't think she was serious. She just wanted to get out of my clutches. "Now let go of me."

"Give me a big kiss and I'll know you're serious," I demanded.

"Only in your dreams!" my sister shot back and struggled some more so I sneaked my hand under her top and unhooked her bra. I'd been practicing that move with Mom and Alice and I've gotten pretty good at it. Sheila turned a bright red in her face. She looked toward the kitchen door and then leaned down and presented her lips to mine. I jammed my tongue into her mouth while kissing her and slipped my hand under her top and loosened bra to cup her bare tit. She squealed in muffled protest but was helpless to prevent it. I heard a car door slam and knew my dad was home. I ended our kiss and let go of her. She jumped up and glared at me.

If looks could kill I'd be dead by now. Sheila didn't say anything but stomped away to go meet Dad at the door. What the hell I decided. I followed close behind and when she reached an old alcove I grabbed her again and pulled her struggling figure behind the curtain. My parents' house is kind of old and has things like alcoves. "Damn you! Not again!" I muffled her protests with my hand and our Dad walked right past without noticing us.

"Hi, honey," Dad said. "How's my baby doin'?" Mom was back out of the kitchen. He kissed his wife and caressed her belly. I smirked a bit. My dad thought he was the father.

"He's doing just fine," Mom said and kissed him back.

"Where's Eric and Sheila?"

"I don't know," Mom replied. "They won't come until called. I'm sure of it."

"Can't you wait until tonight?" What the heck was Mom doing?

"I want it now." My mother stepped away from Dad, pulled up her skirt, yanked down her panties and braced herself over the back of the sofa. Sheila and I gasped. I'd forgotten I was holding my sister against her will and had let go of her but Sheila made no move to escape.

"The kids, June!" Dad looked nervously around but he couldn't see us.

"Joe Oliver," Mom said, "if you don't start fucking me right this second I'm not going to let you touch me again for the next two years." Dad took another look around and stepped up behind his wife. "Make it good," Mom ordered and gasped as Dad penetrated her snatch. They were fucking in the front room! Mom turned her head and looked directly at our hiding place. I finally figured out that Mom was helping me seduce Sheila. She must have been spying on us from the kitchen. I didn't waste any more time. I freed my stiff prick from my pants. I then put my fingers inside the waist of Sheila's jeans and yanked them and her panties down below her knees. She'd been so distracted in watching our parents fuck that it was too late to grab at them.

"Stop it!" Sheila hissed but not loudly. I ignored her. My hand dove between her legs and started caressing her clit.

"We're going to fuck just like those two out there," I whispered.

"I'm your sister," Sheila protested but I knew she was already out of control. Her snatch was lubricating well and when I kissed her she started kissing back.

"You're my personal slut," I replied. I raised her leg and pulled the jeans and panties free. My sister looked scared but no longer struggled or protested. I gently pushed her to the floor and mounted her. "We're fucking now, slut. What do you think of that?"

"Just be careful," Sheila begged.

"What's to be careful about," I asked as I continued humping her. "No one will catch us if we're quiet." Mom was making plenty of noise to cover our own noise.

"I'm not protected. You could give me a baby." Ha! That was just what I wanted to know.

"What if I want to give you a baby?"

"Y-you can't. I'm your sister."

"You're also my personal slut. Now what are you?"

"Your personal slut," she answered right away. Sheila was a quick learner.

"And what do guys do with their personal sluts?"

"A-anything they want," Sheila replied. "Oh gosh, Eric. Please don't give me a baby."

"That's exactly what I intend to do and you're not going to do anything to prevent it. Do you understand?"

"Yes," my sister squeaked and I felt her shudder through a cum.

"What was that?" I heard my Dad say and we both froze.

"I don't know and I don't care," Mom replied. "Let's go upstairs."

"You were never this hot when you were pregnant before," Dad said.

"It must be my midlife crisis. Now hurry up." I could hear my dad say something else but his voice faded as he and my mom climbed the stairs.

"Now it's my turn," I told my sister. "I'm going to cum inside you and give you a baby."

"I don't care," Sheila whispered. "Give me your child to carry, baby brother. Cum inside your slut sister and make her pregnant. Make me have your bastard." With that I started spewing a healthy load of my sperm into my oldest sister's breeding hole. We lay together catching our breath and exchanging kisses without saying anything. After getting dressed Sheila and I stepped from the alcove just in time to see our mom come downstairs.

"Oh, there you two are," Mom said. "I've been looking all over the house for you. Dinner is getting cold." Sheila blushed and I grinned.

"Where's Dad?" I asked. "His car's outside."

"I guess he had a rough day at the office. He's taking a nap right now. He'll be down later." Mom and I had good appetites for dinner but Sheila just picked at hers. I never did see Dad during dinner. Mom must have really worn him out.

After dinner I walked up behind Mom and embraced her. "Thanks for your help with Sheila," I said.

"I can't believe I did what I did. What are your intentions with your sister?"

"I want to knock her up and do the same with Vanessa." She gave me the same 'are you crazy?' look that Sheila gave me but didn't protest.

"Sheila's right about you being a brat. Just be careful," she warned.

"I will," I assured her and gently caressed her belly. I wanted to fuck my mom right there but I needed to save all my sperm for Sheila. I kissed her and headed upstairs.

"Just be careful," Mom warned again.

Sheila looked kind of startled and upset when I walked into her room without knocking. I didn't care. My slut didn't have any right to privacy from me. "I was just about to take a shower," Sheila said and pulled her bathrobe tighter around her tits.

"You're not thinking about washing out my sperm are you?"

She sighed and shook her head. "It's too late for that." Sheila embraced me and laid her head on my chest. "What am I going to do if I'm pregnant, Eric? Robert's not due home until the end of next week."

"You'll find a way." If there's one thing I learned about women it was that they were experts in fooling men into accepting other men's bastards as their own. Alice Perry and my mother had done that with their husbands. Hell, I'd never be sure if they hadn't fooled me too. Sheila would find a way. I loosened the belt on Sheila's robe and pulled it from her shoulders. She was naked now but didn't seem shy about it. I pushed my sister onto her bed and fucked her again. Later that night I fucked her a third time. Sheila never did get her shower.

We were startled awake when Mom said, "Up and at 'em, you two. Breakfast is on."

"Oh my god!" exclaimed a panicked Sheila when Mom left. "She caught us sleeping together. What'll we do?"