Her bawdy pun made all three of us laugh for a bit before I lowered my head to start kissing her again as I began to slowly withdraw my cock from the almost too-small confines of her womanhood.
When only a third of my penis was still inside her, I reversed direction and began pressing myself into her again. I wasn't quite as slow about it that time because of the ample coating of her oils that she'd left on me. My inward journey ended with a bit more of my cock inside her than the first time: I could feel the deepest part of her touching the very tip of my manhood. A moment later, I repeated the cycle a trifle faster. Then again, faster still. Over the course of the next couple of minutes, I began making love with her: slowly at first, then gradually increasing the speed and length of my strokes until I'd settled into a rhythm that clearly pleased her but without stimulating ME too much – I still had her mother to deal with, after all.
It didn't take me long to realize that the kid that had gotten her virginity must have been as good as she'd said: there couldn't be any doubt at all that she enjoyed the hell out of sex, rather than still trying to get over some bad initial experiences. I thought to myself that if he'd been as good with his brain as he was with his dick, he'd still have her.
That train of thought was quickly derailed, however, in favor of focusing my attention on Sarah – and more to the point, what we were doing.
As I looked down at her, I could see that Sarah was fully and completely into what we were doing; the expression on her face was one of pure, unadulterated joy and pleasure while she made an assortment of small, pleased noises. She would frequently look up at me, but I could tell that she wasn't really seeing me – she was simply too immersed in the sensations created by our union.
I knew that my wish to get Sarah off before I did was working just a few minutes later, when I felt her body begin to tense underneath me. Not only was she getting tighter around me, but her entire body was intermittently tensing up. It was infrequently, and just for a second or two at first; but as the seconds ticked by, the spasms not only lasted progressively longer and longer, but hit her more frequently, too. I wasn't surprised in the slightest when they finally merged into one big spasm that froze her in place for several seconds as she released a prolonged soft groan. Her vagina got even smaller around me as it happened, but I was able to continue thrusting myself in and out of her womanhood because of a dramatic increase in how wet she got inside.
With the passing of the first wave of her release, Sarah wrapped her arms around me and pulled me down on top of her as she arched her back, trying to get as much of my cock inside as she could. I managed to bury myself in her a fraction of an inch farther – which seemed to be enough, since her second spasm easily seemed to be the equal of the first. As it overtook her, she hugged me tightly enough that it wasn't easy for me to breathe; but the warm cushions of her breasts and the hard pebbles of her nipples easily made up for it.
When I could make my escape from her tight embrace, I resumed my pistoning in and out of her before lowering my head to begin sucking on the peak of one of her breasts. I feel it respond to my efforts by getting firmer between my lips, and its nipple erecting even farther before I switch my attentions to its mate.
Before her orgasm has finished, I've gotten both of Sarah's nipples glistening with my saliva and standing as tall and proud as I think they can. When she's aware of me again, Sarah looks up at me with a mix of appreciation and raw, unbridled lust before she manages to softly tell me "Damn, that was nice! And you're able to keep going, too!"
Beside me, I hear Helen say "She's got the same problem I do – when we climax, we get so small and wet inside that guys usually cum because of it. If you can keep that from happening, then I know I'm going to like having you do me, too!"
Hearing that, I figured I was going to like doing her. But before then, I wanted to make sure and enjoy the experience of the lovely young Sarah – and do my best so that she enjoyed it, too.
It's only a few minutes before Sarah starts to go through the cycle of body-tension that she had on her way to her first orgasm. The second iteration of it seemed to be a 'condensed' version of the first, but with the same end result. Sarah didn't try to hug me after the second; I could feel her body starting to respond again even before she fully had her wits about her.
The third time, it took only a couple of minutes before Sarah was again tensing underneath me, and her climax hit her even faster and more powerfully than the previous times. She barely had time to catch her breath before the cycle began to repeat itself; by the end of it, I could tell that having had four progressively more powerful orgasms in such a short period of time had exhausted her. I gradually slowed, then stopped, my movement in her to look down at her and ask "Do you need or want to take a breather?"
Still panting, she stared up at me for a couple of seconds before answering "Yes, to both – I want, and desperately need a rest. I didn't think that last one was ever going to end! And you weren't helping any by biting my earlobe while you were still fucking me, either!" – the playfully accusing tone of her voice telling me that she wasn't really upset with me, only tired.
Helens shared a deep and loving kiss with her daughter before she turned her head to tell me "She doesn't have all that much more stamina than I do, so if you can tire her out, I know that I'm in for the fucking of my life – and I can't wait for it!"
I took that as my cue to ease myself out of Sarah's intimate embrace and sit back on my heels. Helen looked first at where my erection was standing up between my thighs, then at the rest of me. Seeing the fine sheen of perspiration I'd developed, she told me "When we stop, I want it to be because either I wore out like she did, or you came – not because you got too tired. Lie down, and I'll get on top. At least, for as long as I can, judging from how you left Sarah feeling!"
I did as she instructed, but before she could move over me I told her "I expect it would be a little easier for you to get started if you'd let me get you a little 'warmed up' first…"
Helen looked pleased at my offer, and readily moved to straddle my head so that I had a most delightful view up the front of her body. Cupping the firm globes of her ass in my hands, I lifted my head and ran my tongue along the divide formed by her labia. She'd apparently enjoyed watching me and Sarah, because there was a ready supply of her juices for me to sample before the tip of my tongue reached her clitoris. She tilted her head back and moaned in response to my effort; with that kind of feedback from her, I was more than happy to repeat my actions again and again and again…
It couldn't have been but a minute or two before Helen was moaning almost constantly; I slid my hands upwards from her ass, so that my hands could slip under hers where they were squeezing her breasts and pulling and pinching her nipples.
With me providing the desired stimulation there, too, Helen leaned backwards, supporting herself with her arms. That tilted her pelvis enough that I could run my tongue from her perineum to her clit, stimulating her that much more. She was fairly dripping her nectar onto my tongue when she sat up again, telling me "Dear God, I didn't think a man could eat me as good as another woman, but damned if you can't! But I don't want to cum that way; I want it to happen from a nice, hard cock in me."
Having said that, she was visibly reluctant to lift herself off of me and move down to my waist and hips. Looking at where my now-only-mostly-erect cock was resting against my belly, she said "It looks like you could use a little 'warming up', yourself…" before leaning over enough to take my slightly Sarah-sticky penis in her mouth and both cleaning it and bringing me back to full erection. Once she was satisfied with her handiwork, she swung a leg across me so that she was straddling my hips.