"I guess we all do."

Uncle Rory had met Janice Rae at some literary do in Glasgow. She was ten years older than him, a librarian, divorced, and had a ten-year-old daughter called Marion. She lived with her mother, who looked after Marion while Aunt Janice was at work. I could remember the two of them coming to the house for the first time. Uncle Rory had brought various women to the house before; I'd ended up calling them all aunty, and I was calling Janice that by the end of the first weekend they spent at Lochgair.

Despite the fact that Marion was a girl and a couple of years older than me, I got on well enough with her. Lewis — also two years older than me — was going through an awkward stage during which he wasn't sure whether to treat girls with scorn and contempt, or sweeties. James, born the year after me, liked what and who I liked, so he liked Marion. She became one of The Rabble, the generic and roughly affectionate term my father applied to the various kids he would tell stories to on a Family Sunday.

A Family Sunday was one when either the McHoans or the Urvills played host to the other family, plus that of Bob and Louise Watt. Aunt Louise had been born a McHoan; her father was the brother of Matthew, my paternal grandfather and husband of Grandma Margot, she of the heart that broke only after she was safely dead. Bob Watt was brother of Lachlan, whose taunting of Uncle Fergus concerning the matter of hiding inside a medieval lavatory led to the unfortunate incident with the display case and resulted in Lachlan becoming the man with four eyes, but who did not wear glasses.

Bob Watt never turned up for Family Sundays, though Aunt Louise did, often wearing thick make-up and sometimes dark glasses. Sometimes the bruises showed through, all the same. Now and again there'd be something she didn't even try to hide, and I can recall at least two occasions when she turned up with her arm in a sling. I didn't think very much about this at the time, just assuming that my Aunt Louise was somehow more fragile than the average person, or perhaps excessively clumsy.

It was Lewis who eventually told me that Bob Watt beat up his wife. I didn't believe him at first, but Lewis was adamant. I puzzled over this for a while, but at length just accepted it as one of those inexplicable things that other people did — like going to the opera or watching gardening programmes — which seemed crazy to oneself but made perfect sense to the individuals concerned. Maybe, I thought, it was a Watt family tradition, just as Family Sundays and at least one person in each generation of our family managing the Gallanach Glass Works seemed to be two of our traditions.

Mum and Aunt Janice became friends; she and dad were much closer in age to Janice than Rory, and they were parents, too, so perhaps it was no surprise they got on. Whatever; after Uncle Rory disappeared, Aunt Janice and Marion still came down to the house every now and again. It was the year after Rory vanished that Marion, then about fifteen, got me into the garage where the car was. We'd been out on our bikes, riding round some of the forestry tracks one hot and dusty September day; everybody else was in Gallanach, shopping, or — in Lewis's case — playing football.

Marion Rae had the same curly brown hair her mother did. She had a round, healthy-looking face which even I could see was quite pretty, and was about the same height as I was, though a little heavier (I was of that age and body-type concerning which adults help to ease the difficult journey through the age of puberty by making remarks about disappearing if you turned sideways, and running around in the shower to get wet). We'd seen some old burnt-out wreck of a car abandoned in a ditch, up in the hills; I'd said something about the sports car under the covers in the courtyard garage back at the house; Marion wanted to see it.

I still maintain I was seduced, but I suppose I was inquisitive as well. Girls were still less interesting to me than models of the Millennium Falcon and my Scalextric set, but I had conducted a couple of masturbatory experiments which had set me thinking, and when Marion, exploring the warm, dim, tarpaulin-green gloom of the old car with me, said, Phew she was hot, wasn't I? and started unbuttoning her blouse, I didn't say No, or run away, or suggest we get out of the stuffy garage.

Instead I blew on her.

Well, she was sweaty, and I could see moisture on the top of her chest, above the little white bra she was wearing, trickling between the white swells of her breasts. She seemed to appreciate the gesture, and lay back and closed her eyes.

I remember her asking if I wasn't hot, and feeling my leg, and her hand running up to my thigh, then there was some silly line like, "Oh, what's this?" as she felt inside my shorts, expressing what even then I thought was probably fake surprise at what she discovered there. My own words were no less inane, but something — either the heat of the moment or just retrospective embarrassment — seems to have wiped them and most of the subsequent relevant details from my memory. Still, I recall being pleased that everything seemed to fit, and work as well, and if our (now I think about it, ridiculously fast) mutual thrusts hadn't unsettled the car on its blocks, that sense of having successfully risen to the occasion and worked out what to do with relatively little guidance would have been my abiding impression of the proceedings.

Instead, just as I was both coming and going (going; "Wow!), and Marion was making some extremely interesting noises, the car collapsed under us.

It shuddered and fell onto the concrete floor of the garage with an apocalyptic crash. We'd shaken it off its blocks. Some bizarre sense of symmetry had made me insist that we should not lie across the back seat, but that I should instead squat on the transmission tunnel, with Marion half on the rear seat, and half on me. As a result, the Rapide fell backwards off its wooden supports and its boot rammed into a load of drums and cans stored behind it, crushing them in turn against an old Welsh dresser that had been consigned to the garage years earlier; this — loaded up with tins and tools and spare parts and junk until it was top heavy — proceeded to over-balance. It leant, creaking, towards the car, and — although it did not actually fall over — distributed most of its load of paint, spanners, plugs, bolts, spare bulbs, bits of trim, hammers, wrenches and assorted boxes and tins all over the tarpaulin-covered boot, rear window and roof of the Lagonda.

The noise was appalling, and seemed to go on forever; I was dead still, my orgasm — more quality than quantity — completed, and my mouth hanging open as the cacophony reverberated through the garage, the car and my body. Dust filled the car's interior; Marion sneezed mightily and almost squeezed me out of her. Something heavy hit the rear window, and it went white all over, crazed into a micro-jigsaw of tiny glass fragments.

Eventually the noise stopped, and I was about to suggest that we ran away very soon and to some considerable distance before anybody discovered what had happened, when Marion grabbed both my buttocks with a grip like steel, stuck her panting, sweat-streaked face against mine, and snarled those words with which I — in common with most men, I suspect — would eventually become relatively familiar, in similar, if rather less dramatic situations: "Don't Stop."

It seemed only right to comply, but my mind wasn't really on what I was doing. Another precedent, perhaps.

Marion seemed to have some sort of fit; it coincided with — or perhaps was the cause of — the rear window falling in. It showered us both with little jagged lumps of glass, green under the tarpaulin-light, like dull emeralds. We both stayed like that for a bit, breathing heavily and brushing crystalline fragments out of each other's hair and laughing nervously, then started the delicate business of disengaging and trying to dress in the back of a tarpaulin-covered car full of gravelly glass.