Ever since I was a boy I had always taken my mother a cup of tea in bed on Sunday mornings. Then I'd sit on the edge of her bed and chat to her while she drank it, and afterwards I'd take the empty cup and saucer away and she'd go back to sleep.
I must admit that, apart from being a dutiful son, I enjoyed looking at her half-revealed body as she sat up drinking her tea - her nightdresses left very little to the imagination, and I was often treated to a glimpse of a naked breast, as well as feasting my eyes on her bare arms and shoulders.
And so it was one Sunday morning in my late teens: my mother was sitting up as usual, the bedclothes pushed down below her waist, and I could see her nipples poking against the thin cotton material of her nightdress. It was very low-cut, and one strap persisted in slipping off her shoulder to briefly expose even more of her breast before she hoisted it back up into position.
I don't remember what we talked about - most of my attention was focussed on her body, but then after she handed the cup and saucer back to me her pillow slipped off the opposite side of the bed. She squirmed over to retrieve it: the bedclothes slid down even further, and I saw that her nightdress was rucked up, completely exposing her bare bottom.
Almost without thinking, I gave it a playful slap, but perhaps harder than I intended. My mother's body went rigid: I saw her fingers clutch the sheet, gripping it until her knuckles whitened, and then she turned back towards me, a strange unseeing expression on her face.
'Mum - I'm sorry - I didn't mean ...' I began, afraid that I'd hurt her, but she interrupted me, almost as if she hadn't heard me.
'Spank me! Spank me properly!' she whispered, and before I could answer she threw back the bedclothes completely and crawled across my lap, dragging her nightdress up around her waist.
I rested one hand on her bare back, staring at her naked backside with my other hand on the backs of her thighs, and then I brought it down sharply on her bottom. Mum gave a little cry, and I felt her body shiver, and then I spanked her again. I don't know how many times I smacked her quivering buttocks, but soon they were glowing red, and my mother started to moan uncontrollably.
Suddenly her body began to jerk, and I stopped spanking her, instead letting my hand caress her bottom. Mum was gasping, and she struggled up beside me.
'Hold me, darling!' she cried, and I took her shuddering body in my arms while she clung to me as her orgasm flooded through her. The strap of her nightdress had slipped down again unheeded, and I was unable to resist cupping her naked breast in my hand, fondling it as she turned and buried her face in my shoulder.
At last my mother stopped shuddering, and her breathing gradually slowed to normal. She smiled at me uncertainly, and stroked my face, and then her hand dropped to my groin. I was wearing just the trousers of my pyjamas, and Mum slipped her hand inside to grip my throbbing penis.
'My poor darling,' she whispered. 'Doing that to me made you excited, didn't it? I'll take care of you, dearest,' and with that she started to rub me slowly. My right arm was still around her, while I continued to fondle her bare breast with my other hand as I looked down to watch my mother's hand sliding up and down my rigid cock. I held back as long as I could, but soon I felt myself losing control.
'Mum - stop it! I - I'm going to come!'
'It's all right, darling,' she whispered, and then a great jet of my semen shot up and landed on her throat. She gasped as my semen continued to spurt over her body, and then she turned her head to kiss me passionately on the mouth as I gripped her naked breast, sinking my fingers into her soft flesh.
My mother kept rubbing me, her mouth working on mine, until my cock gradually started to soften. She still fondled me for a few minutes, then gently drew back.
'I think you'd better go now, dearest,' she said, and removed my hand from her breast. She carried it to her lips and kissed it, then smiled at me.
'Please go, darling, before ...' she didn't finish the sentence, but she released my hand and moved away from me. I didn't know what to say, but I got to my feet and went to the door. I looked back at her briefly, just in time to see her pulling her nightdress, soaked with my semen, over her head, and I was able to see my mother's completely naked body.
I showered and shaved, made myself some breakfast, and then went for a long walk, re-living every moment of what had happened. My mother was still in bed when I got back: her door was locked when I tried it, and when I called out asking her if she wanted anything she just said she wanted to sleep.
It wasn't until the evening that I saw her. She moved stiffly as she prepared dinner, and when we sat down together I heard her catch her breath, then wriggle uncomfortably on her chair.
'Mum - I'm sorry if I hurt you,' I said, and she smiled.
'It stings a bit, and I'll be sore for a few days, darling - but it's lovely!'
She squeezed my hand across the table. 'Now you've discovered one of my vices - but we mustn't make a habit of it - although perhaps now and then ...' Her voice trailed away, and she squeezed my hand again.
'Did you like doing it to me, darling?'
I hesitated. 'At first I was a bit afraid of hurting you, but then looking at your bare bottom, and feeling it ..' It was my turn not to finish a sentence, and Mum caressed my fingers.
'It can become addictive - I should know, I've loved it ever since ...'