Not My Husband's Child - Cover

Not My Husband's Child

by Lisa Anne

Copyright© 2025 by Lisa Anne

Erotica Sex Story: A woman, house-sitting for her sister, becomes aroused after finding her sister’s vibrator and watching a porno...

Caution: This Erotica Sex Story contains strong sexual content, including Ma/Fa   Drunk/Drugged   Reluctant   Incest   InLaws   Anal Sex   Double Penetration   Masturbation   Oral Sex   Pregnancy   Sex Toys   Size   .

I was house sitting for my sister while she and her husband were out of town visiting family. I was at her house for the day while I was washing my clothes and taking care of their animals. My sister and I are animal lovers (no, not in that way), and I knew she needed someone to take care of them while they were out. Plus, it was good to get out of my house for the weekend.

My husband and I had been fighting again. Well, actually, he’s the one who’s been fighting with me. I don’t know why I dated him for six years and then decided to marry him. Nothing has changed since the first fight all those years ago. My husband is a sex maniac. If I’m tired or having my monthly cycle and don’t want to have sex, he gets like a child who has his favorite toy taken away.

Well, this weekend wasn’t the case. I just wanted to be away from him. I don’t know why I didn’t marry someone like my brother-in-law. He treats my sister with respect and doesn’t expect sex every night. In fact, she’s told me that since they have moved out here, the sex has gotten better, and his stress levels are down, and his penis is thicker and longer.

He’s about 6 1/2 to 7 inches, and she told me that she’s been gagging on his cock when she blows him. She also told me how much more cum he shoots out too. Honestly, some sisters wouldn’t get turned on by that, but it makes me yearn for my husband to be the same way, and my crotch gets a little wet when I think about it.

So I put a load of laundry in the wash and was thinking of taking a nap. The day was hot, and the dogs were tired from playing outside. I went into their bedroom and turned the TV on to fall asleep while watching a movie. My brother-in-law, David, doesn’t like light coming into the bedroom when he’s sleeping, so it was dark when I walked in there.

I found the closest lamp to the door, which turned out to be my mom’s old lava lamp from college. Groovy. I got on their bed and made myself comfortable. I remembered that they had a small battery-operated clock by the bed (I had used it a few times that I slept on their couch when visiting). I fumbled around in the near dark and I knocked something off of the table.

“Great,” I thought. “I just broke something.”

I reached down and it was my sister’s new vibrator that David bought for her for Valentine’s Day. She told me how it was a gel-based vibrator and was styled like a realistic penis, but with these rings on them. I looked at it in the low light and noticed how nice it felt in my hands. It really didn’t help that I kept thinking about how much my sister told me it felt so real and was as close to David’s cock size.

I put it back in its former place and turned the TV on. I took my shorts and top off and grabbed an oversized t-shirt. It smelled funny. Not a disgusting funny, but a manly smell. Like a hint of Old Spice. I figured it was my brother-in-law’s and that my sister slept in on occasion.

It didn’t take me long to start getting drowsy and the crappy afternoon movie helped make me fall to sleep faster. While I was falling asleep I could hear moans and groans from the TV as a steamy scene came on. Blurry-eyed I tried to see what was going on. No luck, the sandman had hit me hard and I was out.

I awoke a few hours later from a very erotic dream. That damn alarm clock beeped just as I was getting it good in both ends. I never had that done to me before and as I lay there on the bed I started going over the dream, I reached down and found myself soaked. I laid there for a few more moments thinking about the dream and how it came about. I figured it was the sex scene I saw before I fell asleep and thinking about the vibrator I knocked on the floor.

I thought about my sister and her husband doing it on this bed and how tender his touches probably were. Seeing that my sister and I shared many sex stories from our bedrooms, I figured it was another reason I was so worked up. I thought about my husband and the sex we had together and for a moment I thought about calling him to see if he would come over and give it to me. But after remembering our fight, I opted not to call him. Fuck him, let him sit there and jerk his little pud to an Asian porno.

I looked down again and removed my panties. As I lifted up the oversized shirt I was wearing, I caught another faint whiff of the cologne. I was turned on by it. I laid there with my legs slightly parted, thinking that I should just masturbate to get my urges down. Seeing that I was married, I rarely needed the chance to finger myself. That was unless my husband asked me to so he could get hard.

I had a small thought about the vibrator that was sitting only a foot away from me. I thought about how much my sister loved to have it in her. I thought about how cool it felt in my hands as I picked it up off the floor. I knew my sister was a neat freak and always cleaned. I knew she had probably thoroughly washed her dildo and other play toys. But I got up, weak-kneed, and picked up the purple love toy. I strolled to the bathroom, as if it was leading me, and ran it under some hot water.

“This not only will help get the lint off of it from falling on the floor but will also make it feel more real,” I thought to myself.

I peeked around the corner and saw that the dogs were still asleep, so I walked back into the bedroom and quietly closed the door behind me. I glanced over to the TV and noticed a few pornos that my sister had shown me one day while her husband was at work. I had asked her about a sexual technique, and she showed me it on a porno they had bought. So I put it in and gently crawled back up on the bed.

Right before I settled down, I noticed another toy. It was blue and thin. Like a little ball joined onto a slightly bigger one and continued to do this until it hit a base. I remembered my sister showing me it too. It was an anal toy that she and David used from time to time. It also vibrated. I took it out of the package and noticed it was clean as well. So, I scampered off to the bathroom again and ran it under hot, soapy water.

When I returned to the bedroom, the “sex chat phone lines” commercials had ended, and the porno had started. I sat there rethinking what I was about to do. I mean, no one else was going to find out. My sister and her husband wouldn’t be back until the next day, and my husband was helping a friend fix his roof. So, I sat back and watched the movie.

About 30 minutes into it, I noticed that my pussy was starting to trickle a little bit of lube. I ran my fingers over myself a few times, and with the other hand, I picked up the “purple vibrating love rod”, as I like to call it. I looked at it one last time, hoping I would talk myself out of it. I ran the shaft up and down my slit. It felt good, and my body allowed me to let out a sigh to let me know how good it was.

Then came the scene that my sister had shown me. I was getting hotter. I had placed the dildo butt down on the bed and was rubbing the dick head up and down my slit when the knob on the end jumped to life. Thankfully, it was the lowest vibrating setting, and I felt my juices turn to cream. I rubbed the head of the dildo around the opening of my pussy as I pulled the oversized shirt up over my tits. I held my breath and lifted my legs up and bent them so my knees were almost touching my boobs. I reached down and started to guide the biggest cock in my life into my burning pussy.

I felt the head slip in and then the first ring. I stopped because I was trying to let myself adjust to the size. I smelled the shirt as I drew another deep breath and eased the dildo further up my pussy. I did this for a few more moments until I felt the fake nut sack resting at the entrance to my vagina. I laid there holding the fake cock with my pelvic muscles. I couldn’t believe I took the whole thing! I felt it vibrating deep in me as it tickled my cervix.

I was cumming and cumming hard. I put my hand now to keep my new prosthetic lover in me. I was in heaven. My husband had never bottomed out as deep as this dildo did. Hell, none of the guys I fucked in school got this deep. I put my legs down and sat up on my knees. I held the dildo in as best as I could, but I felt half of it slide out the butt of it rested on the mattress below me. I reached over to the anal toy.

Thinking of the dream I had, I placed the point at my little butthole. Relaxing wasn’t hard for me seeing that I had just come. So I lowered myself down on the anal toy. At first, I didn’t know if it was in. I reached back with my free hand and counted how many bumps on the toy were exposed. So far, two had gone in. I was excited because it wasn’t hurting.

I slowly lowered myself down on the anal toy and at the same time I was sliding back down the dildo that was still gyrating inside my hungry pussy. After a few moments, both toys were deep in their positions. I leaned over on my hands and knees and grabbed an oversized pillow that was on the other end of the bed. I propped myself up on it and started sliding each toy in and out of their holes one at a time.

I was doing it! I was emulating my dream. I looked up at the porno and saw this chick getting it in her rear. I imagined it was me. I started grinding hard on the dildo when I caught a whiff of that cologne again. I then realized it was my brother-in-law’s scent. And just as I realized that, I let out a loud groan as my pussy spasmed against the deeply penetrated visitor, and I ground the anal toy deep in my ass. The whole time I was cumming, I was thinking of David.

I laid there for a few minutes, catching my breath. I was sure that I woke the dogs. I got up on shaky legs and let both of the toys slide out of their positions. I went into the bathroom and cleaned them both up and put them back. As I was checking the laundry, all I could think of was David. If my sister was correct about his cock and how gentle he was, and that the dildo was 95% identical to his, I wanted a part of him.

A few weeks passed, and I had thought about my sex adventure off and on. It made me very wet when I thought about it. In the past, my sister and I shared clothes, we shared a bathroom, we even shared the same room when we were kids, but there was no way she would let me share her husband. I had to think of a plan, and I had to think fast.

The waiting was starting to kill me. I even tried not to fantasize about him when my husband was fucking the shit out of me. Then, a few months later, came the day I was hoping for. David was celebrating his 30th birthday, and as a big deal, we went to this Hawaiian-themed hotel for the weekend to celebrate.

As I walked up to the Kona Kai hotel, my heart was racing.

“This is it, girl, this weekend is when it will happen,” I told myself.

“But how?” I answered.

As luck had it, my husband wasn’t going to stay the last night of the party due to his work schedule. I walked into the lobby with my husband and met my sister and her husband. They had secured the biggest room months in advance, an apartment suite, and we would both have separate rooms. As we walked into our room, David sprinted up the spiral staircase to the loft where he claimed as theirs.

I threw my suitcase into the room downstairs and took in the ambiance of the room. It was untouched from the date it was built. A 1960’s “swingers pad” if I could say so. I put on my bikini and threw on a pair of shorts and a t-shirt as David and my sister started to get unpacked upstairs. My husband was starting to get antsy and wanted to go swimming, so he left. I heard my sister tell David that tonight she was going to let him do anything he wanted to her to celebrate his birthday. My mind started to wonder.

“Hey kiddo, you coming with us?” David asked as I snapped out of my daydream.

“Sure, I’m ready. Who wants a drink?” I replied.

“That’s the best thing I’ve heard in the past 30 seconds. I hope everyone else has arrived,” he jotted back.

We had a great time playing in the pool and talking with other Hawaiian enthusiasts (who David had invited) who had come from around the country. He drank Mai Tais and joked with the other artists and enthusiasts who gathered around us.

Later that night after drinking and swimming, we went back to the room. About two hours after we laid down, I heard hushed moans coming from the loft. It sounded like my sister was going to get it good. My husband rolled over, and as I was lightly brushing my pussy, I felt that his prick was hard. I didn’t know if he had heard them as well or was dreaming good.

 
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