Finding My (28M) Sister-In-Law’s (18F) Sexuality for the First Time.

This is my first shot at writing here, so be kind in your comments. Constructive criticism is welcome, but just don’t be a jerk.

*Scene Setting*
“Congrats, Cam! I’m so proud of you!” my wife, Abby, had just told her sister who had just graduated as the valedictorian of her high school. Campbell was 10 years younger than Abby, but they got along like they were just a year or two apart.
“Thank you!” Cam smiled back.
“Yeah, congrats, smarty pants,” I jested, so was our entire relationship. We enjoyed picking at each other. I am essentially a 20 year old in a 28 year old body, and she is far smarter than the average 18 year old. Those two characteristics made our relationship work.
“Do you want to come stay with us this weekend?” my wife asked. It wasn’t out of the ordinary for Campbell to come over and stay three or four days during the summer or winter breaks. My wife is a teacher in a different school system and has had essentially the same schedule as Campbell for the past four years.
“Duh! I wouldn’t want to miss time with my little guy,” Campbell said leaning in to tickle our recently turned one year old son.
We all went back to my in-laws house for a meal and cake and company with the entire family. She was the last of that generation to graduate high school, with the next generation already running three deep. After a few hours, we all decided to head back to our homes and hotel rooms. Abby and I took off towards our house, with Campbell following behind us. We lived about fifty miles away, but it was a quick enough drive that we could go home and not have to stay in a hotel.
As we all walked in Campbell said, “I don’t think I’m used to your new house yet. I can’t believe this is all yours.”
I had just gotten a new job as a financial analyst, working remotely, with a salary that I didn’t deserve. A combination of that, the capital gains that we had gotten on our home after 2020, and the money I had made on the meme-stock frenzy afforded us a new home on the river just a few miles away from where we had lived previously.
“I’m pretty wiped out, I think I’m going to go to bed,” Campbell said. We all agreed, it had been a long day and I knew that it would be just a few short hours before it was my turn to change a diaper.
I was right about the diaper, just shy of 2:30 am I was up changing a wet diaper. I decided to take the baby monitor screen in with me and let my wife sleep rather than letting her hear me talking to Ty. I went and laid down on the couch as I was going to take all of the baby duty for the rest of the night and let Abby sleep.

*Good stuff starts here*
I was in and out of consciousness when I heard a thud come from the direction of the three spare bedrooms. I checked in on Ty and determined it didn’t come from there as he was sound asleep. I noticed the light was on in the guest room that Campbell was staying in. I knocked as I opened the door.
“Are you okay, Cam?” I asked.
“Yeah, I’m fine,” she said as if she had been caught doing something she shouldn’t be doing. That’s when I noticed her hand was pushing a pink dildo up the outside of her left leg trying to hide it from my sight.
That’s when I noticed that she certainly wasn’t wearing any shorts, as she typically did when she stayed with us, and possibly wasn’t wearing any panties.
“I can see that,” as I pointed out what she was trying so hard to hide.
“Oh my gosh, I can explain… I just…” she tried but couldn’t find the words.
“It’s fine. Really. Do you need batteries? Were you looking for those?” I asked. I was far more sexually open than my wife, and knew that sometimes we all needed to have a release.
“Yeah,” she said, disappointed that she had been caught getting ready to pleasure herself.
I fetched the batteries that she needed and brought them back to the guest room, where she was sitting in the same spot embarrassed by me busting her.
“Okay, look. I’ve never had a boyfriend and I’ve never been kissed and I haven’t done this before and I don’t know that I want to, now that you caught me. Josey got me this as a gag gift for graduation, and I just…”
“Campbell, it’s fine. I know better than anybody that sometimes you just need to get off. If you need to get off, then do it. I’m not going to stop you.”
“Okay. I really hate to ask you this, but do you know anything about it?”
“From a male point of view, I can probably help talk you through it. Abby would probably be better to talk to about this.”
“No, I don’t want her to know about this.”
“Okay, well I know that you need to be comfortable, so you won’t need to be embarrassed by this or you won’t be able to do it.”
She took a deep breath and sighed, “Okay, I think I can do that.”
“Next you need to make sure that you’re aroused before you try to shove that thing in, so you would need to massage around your vagina and rub your clitoris to help get yourself aroused.”
“Your proper anatomy terms, aren’t going to make me aroused.” she jested towards me.
“Sorry, your pussy and your clit. Better?” I asked.
She nodded in agreement. I could tell she was beginning the mentally prepare herself for it.
“Once you’re wet enough, don’t force it, just gently push it in and go slow at first since you’ve never done this before.”
Another nod.
“I’ll leave you to it. Have fun. Good night, Cam.” I said as I turned to head out.
“Ty, can you do something for me?”
“Yeah, what’s that?”
“I’ve never been kissed and I want someone that I actually like to be my first kiss. Will you kiss me? That would help me get turned on enough to start too.”
“Cam, I’m married to your sister who is in the other room.”
“You can’t just come in here with no shirt and talk about my pussy and clit and not help me out. Please? Just one kiss and then you can go back to sleep.”
Maybe it was because it was so late, but I thought there would be no harm in it. I went and sat on the bed next to her. I never had really thought about how much sex appeal that she had. Of course, I knew she was beautiful, but she was, in fact, a sexy young woman. She was a soccer star at her high school and had the legs to match, she had very little fat content and her breasts were no more than a B cup, which I actually preferred.
I leaned in and cupped her face with my right hand, our noses touched and I hesitated. We locked eyes and then we both moved in to kiss. Her lips were as soft as any that I had felt before. We kissed again and again, open mouths with no tongue involved. She ran her hand across my bare chest and down to my abs. I heard her breathing change and knew that she was aroused, but now so was I.
I got up to go back to bed, but now my erection was showing under my gym shorts with no underwear. I turned to leave but I felt her grab my hand, she pulled herself up and in one motion wrapped her arms around my neck and our tongues were gently teasing each other in a matter of a second. She was pushing me towards the door, that she was able to shut and push me up against with ease. I wrapped my arms around her slender waist, just above her butt. Her shirt rose up in the back and I can feel that she wasn’t wearing any panties, which only made my cock harder against her torso.
She pulled away while keeping her embrace, “You know those things, that you were telling me to do to myself?” she whispered.
“Yeah,” I whispered back.
“I want you to do them to me.”
Before I knew what was happening she was leading me to the bed and I had no problem following at this point. She got on the bed and took off her shirt exposing her perfect breasts and abs. I took in every inch of her. I chuckled as I made my way to her pussy and was surprised to see a bush that looked like it hadn’t ever been touched.
“What is it?” she asked.
“I just never thought you would have that much hair down there.”
“People shave it?!”
“Yeah they do.”
“Do you?”
“Yeah I do.”
“Show me.”
Before I could decline, she was undoing the drawstring on my shorts and sliding them down over the pants tent I had made for myself. Her mouth dropped at the sight of her first cock. While I’m well endowed at 7.5 inches, I’m far from the biggest. She gently reached out to rub it, her soft, warm hands were a welcome feeling and almost made me cum on the spot. I held it in and continued on my task. I pulled her hands away and had her lay down.
I ran my hand along the inside of her thigh and felt her juices that had been running down her leg. I ran my middle finger from just above her asshole to her clit and started teasing it. She was as wet as anyone I had ever felt, and far more wet than her sister had ever been. She took deep, satisfied breaths before starting small moans. I started moving faster with my finger and even brought in my index finger to help. She was moaning more and more. I decided she was far enough along and slid my middle finger inside her. She arched her back and gasped at the first thing to enter her pussy. I gently worked my finger in and out to let her get adjusted to the new sensation. Once she was acclimated, I worked my way faster and faster. She was moaning more now and I could tell she was getting closer. I kept my rhythm fast and let her cum for the first time ever on my finger. She was spasming on the bed from the intensity from her first ever orgasm before just collapsing in pleasure.
My cock was at full attention by now and I needed to release. I was going to leave her and go take care of it myself, as my job here was done.
“Where do you think you’re going?” she asked as she revived back to life from her euphoria.
“To take care of this,” nodding down towards my dick that was looking straight up.
“No way, I’m doing that.”
“Okay, but I’m going to cum on your tits. They are perfect and I want to coat them.”
“Okay.”, she said as she took it in her soft hands.
I straddled her so that my dick was aimed up from her stomach towards her face and tits. She began jerking motion with her right hand and it was as if she was a pro, even though she had never done it before. I could feel myself getting closer way faster than I wanted it to be over. I held it as long as I could before letting out a grunt and moan, and with it my first rope of cum that landed on her chin. I held in before the rest came and busted like a fountain on her perfectly shaped tits. I took over at the end to get the rest out, and it dripped down onto her abs. I gasped for breath as that was the biggest load that I had released in quite some time.
I leaned down to kiss her again. I gathered my shorts, kissed her again and left.
I got to the door, and she said, “Ty, thank you.”
I smiled back, and her eyes told me that enjoyed her first sexual experience. I did too. Probably too much.

Source: reddit.com/r/eroticliterature/comments/uz46hb/finding_my_28m_sisterinlaws_18f_sexuality_for_the