Ben and Susan’s unusual relation – part 4

This is a story about ben and susan who are siblings but….let’s continue

“I think he misses me too much when we’re apart, he likes to get in the same classes as me when he can,” Susan said before I could speak for myself.

“Or maybe someone just likes to mess with my course selection list,” I replied, choosing something halfway plausible, if untrue, that my sister might have done.

Susan stuck her tongue out at me, then quickly assumed an innocent expression as Miss Ray turned to her. The teacher looked like she was going to say something, but then shook her head in exasperation. She must have been used to my sister’s antics.

“You only need the class for one period right?” Miss Ray asked.

“Yes, just enough so we can practice our skit we need to do,” Susan said. “Doofus over there doesn’t want to do it where people can watch for some reason.”

I rolled my eyes at the name calling and gave my sister a disbelieving look like she couldn’t possibly think I wasn’t going to remember that later.

“Alright, well you can have it fourth period on Friday if you really want it,” Miss Ray said. “I expect to find everything the way I left it though, if you have to move desks around at least put them back afterward.”

I got the impression she was trying to get rid of us at this point, and now that Susan had what she wanted I had no doubt we’d be leaving.

“Absolutely, you won’t even know we were there,” Susan assured her, hopping off the desk where she’d been sitting.

My sister grabbed my arm and dragged me out the door leaving Sherin to follow behind us looking quite amused at everything.

“Doofus huh?” I said as soon as we were out of earshot.

“Just being me,” Susan said with a dismissive wave of her hand. “Don’t want to arouse suspicion do we?”

“Yeah, I’m sure that’s all it was.”

The three of us appeared to be alone, at least temporarily, so I decided I could risk getting a little payback. Susan was walking right beside me so I moved my hand to her butt and gave it a solid pinch. My sister squealed and jumped at the sudden contact, then whirled on me. I had already backed away and was doing my best not to burst out laughing at her reaction, but was unable to restrain myself completely.

After a moment Susan gave in and giggled, knowing full well that she deserved it. Sherin just smiled and shook her head at us.

“Well if you two don’t need me anymore I have to get going,” she said.

“Okay. Remember, Friday fourth period,” Susan said.

“I’ll be there.”

Sherin gave me a small wave, then headed off leaving us by ourselves.

“Guess we should probably head home too,” I said.

“Uh uh, not right away,” Susan said. “First we need to go shopping.”

“Shopping? Why?”

“‘Cause I need a new skirt. I don’t have anything that’ll work for Friday, not properly.” She leaned in close to whisper conspiratorially. “And you’d rather be able to bend me over the desk, flip up my skirt and fuck me than dick around with getting my pants off wouldn’t you?”

“Dammit Kris,” I said.

The mental image I got off that was hotter than what was helpful at the moment. I didn’t need to be walking around with an erection right now even if most people had left the area already.

“Why do you think I insisted on us bringing the car this morning anyway? It’s not like we needed it to go straight to school and back.”

“I did wonder about that,” I said. “Honestly I assumed you just wanted to stop and mess around before we got home.”

“Well I wouldn’t count that out either.” Susan grinned wickedly. “After all I might need some new panties while we’re there, and you’d get to help me pick them out. We never did replace that pair you ripped a while back.”

“If I say I’ll go, will you please stop saying sexy things? At least until we’re in the car.”

“Hm, I guess that’s a good deal. Didn’t plan on getting you too worked up yet anyway. Save that for later.”

In immediate defiance of her previous statement Susan turned and walked ahead of me to where I’d parked the car that morning, swinging her hips in exaggerated motions to keep my attention. I thought about telling her to cut it out, but knew even as the thought came to me that I wouldn’t be fooling anyone; I loved watching my sister’s ass and she knew it as well as I did. At least once we were around people again in whatever clothing store she chose she’d have to behave herself a little. I hoped.


The place Susan decided on turned out not to be all that busy when we got there, but with enough customers wandering around that she couldn’t tease me too badly. I kept an eye out for anyone I recognized because as long as we remained anonymous I knew I could pass easily enough for boyfriend and girlfriend rather than brother and sister.

As interesting as Susan had promised the shopping trip would be, it didn’t quite turn out that way. Searching through an array of skirts for just the right one was not really my idea of a good time, and picking out panties wasn’t enough to make up for that. As much as I liked choosing underwear for my sister, I wasn’t actually getting to see what she looked like in them which cut down on the appeal somewhat.

“What do you think of this one?” Susan asked, holding up yet another skirt for my opinion.

“Isn’t that the same as the last one?” I said.

“No, it’s a little longer and the materials are different. I think I like it better, it feels nicer.”

“Then go buy it so we can be done.”

“Aw, you getting tired of this already? Just hang on a few more minutes and I promise it’ll get better. I think I’m gonna go try these on.”

She had the two not-the-same skirts as well as two pairs of panties that we’d decided on. I figured as long as she wanted my input I might as well see how small I could go before she’d refuse. As it turned out she didn’t seem to have a problem trying out some that didn’t seem like they’d really cover anything properly. That at least had managed to stir up my imagination a little.

There were some semi-secluded changing rooms toward the back of the store and Susan entered one while I remained outside. I was sure boyfriends getting dragged along happened regularly enough that I wouldn’t stick out too much standing there on my own in the clearly meant-for-girls store, but that didn’t mean I was going to like it. I felt quite awkward and not sure where to look, as well as having the small but persistent fear that someone would recognize me. I couldn’t even wander around pretending I was browsing because that really would draw attention.

Finally, after more time than I felt it should have taken just to try on a couple things, Susan opened the door to the dressing room and poked her head out.

“Come in here and tell me what you think,” she said.

“I’m pretty sure I’m not supposed to be in there with you,” I said.

“You big baby, no one’s even going to care. Either get in here or I’ll come out there and I don’t think you want that.”


If we got kicked out I had every intention of telling her “I told you so”, but I hoped she was right that it wasn’t that big a deal. Or at least that no one noticed.

“So I’m kinda liking this one, you think it’s okay?” Susan asked as I closed the door behind me.

There wasn’t a lot of space with both of us inside, but it wasn’t too cramped either. Susan was standing in front of the mirror examining the skirt she had put on critically. I thought she looked hot in it, but didn’t have much of an opinion otherwise. Plus I thought she looked hot in most anything.

“It’s fine,” I said.

“You don’t think it’s too long? I didn’t want to go too short and get in trouble, just keep it at the right length.”

The bottom of the skirt came down to maybe a couple inches above her knees and I knew that given our school policy she wasn’t going to get away with much more than that.

“You look great,” I insisted.

“Wouldn’t matter what I had on you’d still say that, don’t know why I bother sometimes,” she said.

“Because you like hearing me tell you how good you look probably.”

“Oh yeah, that’s it.” She giggled. “I guess if I really wanted compliments I’d go a step further.”

In one deliberate, smooth motion Susan pulled the skirt down to her ankles and stepped out of it. Underneath she was wearing one of the pairs of panties we’d picked out, and it was just as useless at properly covering her as I’d hoped. From behind the panties did little more than draw a nice dividing line down the middle of her ass, and when she turned around I saw that they weren’t doing much better in front. Her pussy was barely covered and if she had any hair down there it would be clearly showing around the edges of the material.

“I’m guessing you like them,” she said.

“Uh, yeah.”

“Even though they’re really, really small in the back?”

As if that was a downside for me.

Susan took my hand and pulled it around to her lower back, then down to the top of her butt.

“I bet they’re just gonna ride up on me and disappear, hardly even worth wearing them,” she said.

I ran my finger down the center of her ass, pressing the panties between her butt cheeks.

“You might be right,” I said.

“Uh huh, but I know you don’t really care do you? You’d like it if I didn’t wear any underwear.”

“I might.”

As I continued running my finger up and down the line of her panties, pushing them as deep as I could, I encountered something I didn’t expect. There was something there, something that seemed very deliberately placed, and I could tell that Susan had been waiting for me to find it.

“Is that…” I started.

“A butt plug, yeah,” she confirmed. “I got it after we talked about you fucking me back there. Actually I got two, the other one’s a little bigger for when I get used to this one. I think I’m almost ready ’cause I sometimes forget I even have this one still in. Told you I’d work on it.”

“And you were wearing it all day?”

“Yep. Had to get off in the bathroom at lunch when I got too horny, but it’s totally worth it. Feels good when I play with it too.”

A shiver went down my spine as I imagined my sister playing with herself and her new toy. I had already been pressing on the butt plug experimentally, but at her encouragement I wiggled it more purposefully making her gasp softly.

“How did it take me so long to figure out how sexy you were?” I asked, not expecting a real answer.

“Because I never had any reason to be sexy for you before,” she said. “Now I do. And I think I’m doing a pretty good job.”

“God, are you ever.”

While I played with Susan’s butt she started grinding slowly on my leg, pressing her body firmly against me. I enjoyed the feeling, but there was an immediate problem to be dealt with if things continued the way they were going.

“You’re going to get those panties all wet if you keep that up,” I said.

“So? I’m gonna buy them anyway.”

“That’s fine, but I’m refusing to be seen with you if you set those on the counter soaked and smelling like sex.”

Susan pouted but offered no real objection, particularly when I knelt down in front of her and started pulling the panties down. I brought them up to my face after she stepped out of them and examined the material closely. There was already a small damp spot, but fortunately nothing overly noticeable if you weren’t specifically looking for it.

As I set the panties aside I was left kneeling in front of my half-naked sister with her bare pussy directly in front of me. I knew it was an incredibly stupid place for us to risk getting caught, all someone would have to do was open the door and we’d have nowhere to hide.

In theory the door was locked, but it wasn’t the sort of lock I would trust with anything important. It was just enough to make people feel comfortable trying on other clothes in a somewhat public location. On the other hand Susan’s perfectly smooth pussy was not something I could pass up easily when it was right there in front of me, begging to be touched.

Ben and Susan’s unusual relation – part 4 will continue in the next page.

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