Our last holiday with my husband and son will always be fresh in my mind. Our son was eighteen, nearly nineteen, and it was his last family holiday with us before he went off to university. My husband, my son and I had spent a lovely day on the beach and I was in bed with my husband, both of us nude. We'd turned out the lights, had a quick kiss, cuddle and romp but we hadn't had sex.
A few minutes later I was still awake when through the wall from my son's bedroom I heard it. Stifled grunts and:
Bump, bump, bump ...
The walls of the chalet we were in were very thin and we knew everything could be heard through the wall between our son's bedroom and ours. I'm quite noisy during sex and I'd had to be particularly careful on previous nights when my husband and I had made love.
I knew immediately my son was masturbating. Perhaps I shouldn't have, but I couldn't help picturing him in my imagination. I knew how boys do it. I'd first got a boy to get his cock and balls right out for me and let me watch him "wank off" when I was about my son's age. Mothers at my son's school had entertained us with juicy accounts of catching their own sons masturbating. Lots of times when I was having my period or just wasn't in the mood for sex but my husband was frisky I'd watched him wank his straining hard penis off, with me usually giving him a "helping hand" caressing his balls and inner thighs as he wanked to get him excited.
But it was more than just imagination. My son is as slim, fit and athletic as any healthy nearly nineteen year old boy. On the beach that afternoon he had been in the briefest speedo style swim trunks I'd ever seen. The thin taut light blue cloth showed the bulging outline of his penis and balls as clearly as if he'd been stark naked.
It had been more than obvious on that beach that my son was having a massive erection. His speedos bulged in a huge ridge that showed the shape of his straining penis shaft, its big round head and the ridge between them in perfect detail. His penis was even bigger than my husband's! My son's speedos were so brief his penis head was all but peeping out at the waistband, and where his straining penis pushed the cloth away from his body I could see a bit of his scrotum and some wisps of his pubic hair, the same colour as my husband's.
Perhaps I'm an incestuous pervert but I couldn't keep my eyes off my son's muscular young body, his bulging speedos and that glimpse of his hairy balls. I felt a mixture of erotic excitement and horror at being so sexually aroused by my own son.
I could tell what was getting my son excited. Near to us were three girls about his age in bikinis so tiny they were hardly worth the trouble of wearing. They were tossing a beach ball around, getting their young breasts almost bouncing out of their bikini tops and their pert young bottoms wobbling in what little there was of their bikini bottoms. I could see my son was doing everything he could to show off his body and his bulging speedos to those girls. The girls' grins and the looks they gave each other showed they'd certainly noticed him and the attention he was giving them. When one of them let the ball bounce close to us and came to retrieve it I could tell she'd done it deliberately to get a closer look.
But it wasn't just those girls. Every woman knows when a man wants her. I was in a new red one piece swimsuit. It was more revealing than I usually wear and I was enjoying still having a good enough figure to get away with it. It was rather low cut between my breasts and held closed at the cleavage just with a little bow. It was high cut at my hips and not much more than a thong strap between my legs and nestling between my bum cheeks. I'd bought it to excite my husband, but it was obvious it was having an effect on my son too.
As I'd moved about on my towel to rub sun cream into my legs I could feel my son's eyes on my body, looking down my cleavage, lingering on that bow between my breasts and on the thin gusset between my legs. That gusset was so thin he must have seen some wisps of my pubic hair. My swimsuit also showed a rather obvious cameltoe line of my vagina slit, and again I felt mixed horror and excitement at unexpectedly finding I wanted my son to see it.
I'd tried not to let myself enjoy his attention. But with this so muscular so interested boy ogling me I couldn't help myself. When my husband was briefly out of sight, as I creamed my thighs I got myself into some rather erotic poses, spreading my legs and thrusting my breasts like the women in my husband's stash of dirty magazines I'm not supposed to know about. I tried of course to make my movements look accidental but I was secretly hoping my son would guess I was treating him!
In the dark of our bedroom I savoured my lecherous thoughts.
Bump, bump, bump ...
My son was holding back for longer than my husband takes to cum when he fucks me. In my mind's eye I saw my son laying naked on his bed with his legs spread wide with that huge erect penis arching up from his balls and bush of pubic hair to that big round head I'd seen outlined. His fist was wrapped round his penis shaft and he was methodically tugging and stroking the way my husband does, with his hand sliding right up over his cock head.
The rhythmic bumping eased off and I heard a stifled groan. I thought he'd come, but then it started up again. I knew he'd been edging, holding his orgasm on the brink to prolong and increase his sexual pleasure, the way my husband does. I heard my son cry out and the bumping suddenly became frantic.
BumpBumpBumpBumpBump ....
Then: