I could tell from her voice exactly what I should think but I told her I didn’t know what to think. I said this partly to be completely sure and partly because I felt that doing so kept me in a better situation.

“Well, he did,” she said. “From when I was nine.” There was a long pause during which she slapped my stroking hand away from her behind. “He still does.”

She turned and stared back at me then, with a fierce and terrible look on her face. She rolled over onto her back, drew her legs up and let them fall apart so that her genitals were fully revealed, still moist and glistening from our last bout of lovemaking ten minutes earlier. “Still want to fuck me now?” she asked, her expression and tone of voice both defiant and desperate. I looked at that raw wound, then into her eyes.

I told her to stay where she was, then got up and went through to the utility room where I found a clothes line. I went back to the room where she lay just as I’d left her. I asked her if she trusted me and she thought about it and then said that she did. I told her to roll back onto her front, which she did. I brought her hands together behind her back and tied them at the wrists. I could hear her crying but trying not to make too much noise about it. I moved an old heavy chair into position and tied each of her feet to its two front legs so that she could not move them, then brought the companion chair round in front of her and carefully raised her by the shoulders and laid her chest and head across the seat.

I told her that of course I still wanted to fuck her, and I did so, though not aggressively or hard. Instead I fucked her very gently and slowly, until I came. Later I untied her and held her while she cried and I told her that she wasn’t to let her father fuck her ever again, but that was the wrong thing to say because she went into one of her rages and tried to slap and punch and bite me, screaming that she couldn’t stop him.

We tied each other up occasionally after that. I did not enjoy being immobilised, though, and so we stopped. I like to think that she stood up to her father and he abused her less after this time but he did not stop altogether and I always knew when he had done so, either from the bruises or from the reopened cutting sites on her body.

I shall be completely honest and record here that I think people make too big a fuss about incest these days. I’m sure it has always gone on. However I had grown to hate Mr F, GF’s father, and this was as much about the physical damage he did to her and the physical damage that he caused her to do to herself as about the fact that he had raped her from the age of nine, taken her virginity, made her distrust everybody and had treated her like a sex toy rather than a person or a daughter. It seemed to me that he had done something quite literally unforgivable, even if GF had been inclined to forgive him.

I rather lost the plot with Mr F. I went too far. I got carried away. It was not so much that I had let it become personal as that it started out as nothing but personal, because I knew nothing else back then.

I broke into their house when GF was away at a camp with the Girl Foresters. She would be absent for a full week. I crept out of our house, took my bike down the lanes and dark back-roads to their house and used the key that I knew lay under a particular flowerpot to let myself in. I had never been to her house but I had a rough idea of the layout of the place. I knew that Mr F would be drunk and fast asleep that night after his weekly Chamber of Commerce dinner. He was in the bedroom, with the light still on. He was lying on top of the bed, face down, half undressed. He was a tall man, gone to fat about the upper chest and belly, but not as well developed as my old man.

I’d grown up and become quite strong. I’d made myself a cosh from a pair of old socks and a load of piggy-bank change. I whacked him on the back of the head and did it again when he started to rear up, roaring. He went down, gurgling, breath spluttering from his mouth as though he was trying to snore.

I gagged him with thick tape, right round his head twice, and tied him up, then dragged him down to the cellar feet first with his head thumping off each step and tied him to the central-heating unit. I made sure he was well secured and properly gagged, then went up to ransack the house so that it would look like it had been a burglary gone wrong. I was wearing charity-shop gloves and a woollen ski mask that looked like an ordinary hat until you pulled it down. On my feet I was wearing a pair of old sneakers I’d found hanging from a tree in the forest a couple of months earlier. I’d padded them with socks because they were far too big for me. In my rucksack I’d brought another pair of shoes, ones my dad thought he’d thrown out and which were even bigger. I changed into them and walked around in them for a bit, opening drawers and pulling stuff out and pulling back carpets and using a crowbar to prise up a few floorboards. I went into what was obviously GF’s room and treated that just the same; I couldn’t not. Even that felt oddly good. When I thought I heard a muffled noise below, I went back to the cellar and Mr F.

I would have liked to have done something to him like he’d done to his daughter, but that would have been to leave a clue, so I just used kettles of boiling water, an old-fashioned blowtorch and a hammer. When I used the hammer I covered his feet or his hands – as appropriate – with a towel, so that no blood would splash on me, though there wasn’t actually that much. Probably the most blood came when I used a cheese grater on his knees. He screamed through the gag so much that I had to cover his whole head in a sack, and then with a bin bag, just to try to shut him up.

I think that he suffocated because I tied the bin bag too tight.

I hadn’t really intended to kill him, not at the start, not until I really got into it, I think, but as I worked on him I think he somehow became less human to me, more just this thing that reacted in a certain way to a certain stimulus, a set of workings that produced a set of noises and a set of muscular contractions and a set of blisterings and discolorations on the skin, according to what I subjected him to. I think also that I started to feel I had done so much damage to him that it would somehow be tidier to kill him off. I don’t mean that I wanted to be merciful, to put him out of his misery – his misery was what was interesting to me – but that he was so badly compromised as a human specimen he had stopped being entirely human. I’m not putting this very well. He was all too clearly human, but he was, he had become, less than human. I would even resist the obvious conclusion that it was I who had done this to him. I had the nagging, perhaps illogical, but quite inescapable feeling that he was doing this to himself, that, despite my total and absolute control over him, he was still somehow responsible for his own torment. I’m still not entirely sure why I felt this, but I definitely did. I think that I developed a sort of contempt for him, despite the fact that I knew I had surprised him and left him with no chance of escaping or resisting me. I’d clubbed him while he was asleep (drunkenly asleep, but still). What chance had he had? None. But that’s just the way things are sometimes.

In any event, I did kill him, obviously. Partly it was because I got distracted when I found an old car battery at the back of the cellar when I was looking for new things to use on him and I believe he expired from lack of oxygen while I was still trying to get the acid out of it. I thought he might be pretending at first. He was completely limp, and there was no pulse in either wrist or under his jaw, but you could never be sure. I used pliers on his fingernails – the fingers were all loose and granular-feeling because I’d already smashed them with the hammer – but he did not react so I concluded he really was dead. I tied the bin bag back round his head – tied tightly, reckoning that if he was dead I ought to be sure of it.