Disclaimer: This is a work of fiction concocted entirely within my imagination. Any resemblance to real people shouldn't be surprising since most of my stories are based on people I know. While I hope you enjoy this story and are compelled to provide feedback, I don't expect the subject matter will appeal to everyone who reads it. As such, I discourage venomous, nasty feedback full of violent wishes against essentially fictional characters in fictional situations. If this story does not appeal to you, there is undoubtedly one somewhere on Literotica that will, so your energy will be better spent on finding it rather than on vilifying me.
Note: If you haven't already, read Lisa & her Sister, which is the prequel to this story.
At some point during the night, Lisa had come back to join me in her bed, but I didn't realize it until I awoke to find her sucking my cock. She didn't notice right away that I was awake, so I just watched and enjoyed the pleasurable sensation of her mouth sliding up and down my tool. She glanced up at one point and saw me watching, so she slipped my cock from her mouth but continued pumping it in her fist.
"You were right about being ready to go again in the morning," she said, "It woke up before you did, so I hope you don't mind."
"Of course not," I replied, "I take it you managed a few more orgasms last night."
"Yes, thank you," she confirmed, "but I could still use another one or two."
"Climb aboard," I suggested, "we'll see what I'm capable of."
She crawled up and straddled me while I eyeballed her naked body in the morning light, confirming that I wanted to continue fucking both her and Julia for as long as I could get away with it. As she guided my cock into her hot, wet pussy, I reached for her tits and caressed them, running my palms over her hard nipples. She was dripping wet and her pussy felt outstanding as it engulfed my throbbing tool. She started bouncing up and down so I released her tits and watched them bounce as I reached around to squeeze her ass. Somehow my attention was drawn briefly from her bouncing tits down to her trim, dark brown bush and it occurred to me that I could probably make her cum more quickly with some clitoral stimulation. I brought a hand around from her ass and started to lightly stroke her clit, causing her to gasp, then went right back to watching her bouncing tits.
I was pleasantly surprised by how quickly my additional stimulation paid off when, after just a minute or so, Lisa suddenly started to shake. I didn't stop stroking her clit, even when she opened her eyes and started gasping for air with a huge smile on her face. She kept riding me and I kept running my fingers over her clit until, after her pace had gradually increased, she dropped forward, supporting herself on her arms. My hand was caught between our abdomens and I couldn't really move my fingertips anymore, so I slipped it free and grabbed her ass again. While licking and sucking her nipples, I was pushing up into her each time she rocked backwards onto my cock.
When she suddenly seemed to go into slow motion and a major shudder passed through her body, I realized that she was already cumming again. I looked up from her swinging tits to watch an expression of sheer ecstasy on her face before she let out a long, ragged sigh. She opened her eyes and looked down at me, smiling, while continuing to slowly ride me.
"You want to stay where you are?" I asked, "Or would you like me on top or behind you?"
"Behind," she replied softly, then started to climb off of me.
She got on all-fours and I moved behind her on my knees, running my hands over her ass before guiding my cock back into her. She immediately dropped her face to the bed and reached back with one hand, I assumed to stroke her clit as I fucked her. I eased my full length into her hot, slippery pussy, holding her hips as my own hips touched her ass. I started to slowly fuck her, savoring the feel of her pussy along my shaft, though I did find myself taking a quick look around for a mirror. Her mirror was similar to Julia's but not set up in a way to reflect the action on her bed. I smiled as I recalled Julia's expression as she'd watched herself riding me and realized that this and the previous night were the first opportunities I'd ever had to think about one girl I'd fucked while fucking her sister.
As I was reaching forward to cup Lisa's swinging tits, she suddenly gasped and I could feel her body trembling as she came again. While caressing the soft smooth flesh of her tits and brushing my palms over her hard nipples, I was thinking that, at the pace she was setting, she might already be at ten orgasms and on her way to fifty. I continued to hump against her ass while fondling her tits and she appeared to continue stroking her clit in pursuit of the next one. When I started feeling the stirrings of my own orgasm, I straightened up and took her by the hips again. I wasn't fucking her faster, but was making sure to give her the full length of my shaft. I watched her ass jiggle each time my hips tapped against it but, the closer I got to cumming, the more I was thinking of fucking her tits again.
Before I'd decided to pull out and turn her over, Lisa gasped again and I felt a tremor pass through her. I was shaking my head and smiling, surprised that she appeared to be cumming with such ease even compared to the previous night. I didn't expect it to be a genetic trait, but I hoped to have similar success satisfying Julia if the plan for the evening worked out. When she'd finished cumming, I did pull out of her and have her turn over. She still looked dazed as I moved up to straddle her and, in fact, didn't bring her hands up to hold her tits together. I took them and held them together around my tool, starting to fuck them while also caressing her nipples. Her arms were still at her sides but I could feel some movement against my legs so I glanced back and, sure enough, she had one finger probing her pussy and one massaging her clit. I think I may have created a monster.
I returned my focus to my own pleasure, feeling the soft, smooth flesh of Lisa's tits not only against my cock but in my hands, as well. She wasn't watching my cock as it peeked out of her cleavage this time, as she had her eyes closed, but I was looking down at her milky globes and debating whether to cum in her mouth again. Since I had penetrated her pussy and her cleavage, I figured I ought to finish up in her hot mouth and, when I finally released her tits and moved up to do so, she seemed to be with me. She opened her eyes and her mouth while bringing her hands up from her pussy to my ass, then engulfed my cock. I moaned as she started voraciously sucking me off and immediately felt my orgasm continuing to build even faster than it had been. I was bracing myself on her headboard while looking down at her inhaling my tool, which only added to the pleasure that I was feeling.
As my impending orgasm caused my cock to swell even more, Lisa remained on task and, when I exploded into her mouth with a grunt, she never wavered. She milked my cock until I was completely spent and, as I moved off of her, she started to sit up.
"I'd better go see if Julia is up yet," she said, grabbing a nightshirt from the back of her door and pulling it on. As she pulled her robe on over it, I figured I should probably get dressed myself. I managed to track down my clothes while she was out of the room and was dressed by the time she returned.
"Rob is awake and said Julia hadn't been downstairs, so it'd probably be a good idea if you guys were gone before she got up," she said.
"Oh sure," I said melodramatically, "now that you're done with me just throw me out."
"Who said I was done with you?" she asked, "My parents are gone tonight, too."
"You know," I said, "I wish you had told me that they were going to be gone sooner. I've got plans already for tonight."
"Crap!" she replied, "Really? Is it something you can change?"
"Afraid not," I told her, "but maybe Rob is free and he'll have our apartment to himself if your sister doesn't go out."
"Are you sure you don't mind me being with him?" she asked, as if I was just testing her loyalty.
"As long as I'm still your first choice and he is only a backup plan, I can live with it," I replied.
I leaned down to kiss her and caress her tit just to let her know that I was sincere, then we slipped downstairs where Rob was waiting. She didn't kiss him before we split and headed out to my car in the driveway.
"So how was fucking Lisa?" I asked once we were on the road.
"Holy crap," he replied, "those titties are outrageous and she loves to fuck, doesn't she?"
"You want a full night with her?" I asked before going on to explain what had happened between Julia and me during the night.
"So Julia is going to tell Lisa that she's not planning to go out tonight, Lisa already knows that I have plans, just not that they're with her big sister and all you have to do is call Lisa later and see if she wants to come hang out," I concluded.
"I'm getting hard just thinking about it," he replied.
"Keep it in your pants until tonight," I suggested.
So everything went according to plan and, when Lisa called late that afternoon to let Rob know that she was on her way, I waited about ten minutes, called Julia and took off. I probably passed Lisa on the highway going in the opposite direction but, even if she'd seen me, it wasn't likely to look suspicious and was better than passing her as she came out of her driveway. Rob knew to call us if something happened and Lisa headed home, but that seemed unlikely as well. I parked in the driveway and Julia was waiting for me at the back door wearing a sundress and looking very pretty. She let me into the kitchen and we were immediately in each other's arms. As I ran my hands down from her hips over her ass, I realized that she had no panties on under her sundress, which made my cock throb so I pulled her against it.
"Let's go to the living room," she said when we finally came up for air, "I want to do something that might seem a little weird."
"You want to reenact what you were watching last night?" I asked as she led me there, "That's not so weird."
"I just keep thinking about it so I want to re-associate it with you and me instead of them," she explained.
