I wrote this story several years ago and posted it on ASSM. It got a good response so I thought Literotica subscribers would enjoy it.
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Helen finished her shower and stepped out onto the bathmat. As she reached for a towel she glanced briefly in the mirror. Sure enough Eric, her eighteen year old son, was peeping through the window. The curtain was a poor fit and there was enough of a gap to see through. Helen fumbled as she lifted the towel from the rail and bent at the waist to pick it up from the floor. She stayed that way for a few long seconds, her shapely backside and thighs directly in her son's line of sight, her puffy reddened sex displayed, before standing again and starting to dry herself. She found it necessary to pull her buttocks wide apart and dab at the drops of water caught between them, then turn round and put one foot on a stool while she meticulously dried her pubic region. It also took a long time to dry each large breast, massaging them almost as much as drying them.
Helen stood naked, side on to the window for a good while longer, applying talc, deodorant, checking for wrinkles. Finally she put on her robe and bundled up her towel for the wash.
She'd been aware of Eric watching her for several months. It was all harmless stuff and she had gotten a bit of a kick out of flaunting her body in front of him. She'd often walked out of the bathroom or bedroom with her robe loose enough that it accidentally revealed a breast, or else while wearing a low-necked t-shirt bent forward to talk to her son or serve him a meal, and since early that summer she had often sunbaked out the back in an almost obscene bikini. She had taken to visibly noticing his discomfort with a growing erection at such times, and he always blushed at her enquiring glances.
The fact was that Helen was finding the whole thing as arousing as Eric was. She had a curvaceous body and loved male attention.
She had been a widow for three years now, but didn't think she would ever get over the loss of Stan, her husband. He had been twenty years older than her and the bond between them had been very strong. She was only nineteen when they had met and although she had been sexually active for a couple of years, sex with Stan had been a real and on-going awakening. Above all he had taught her to express herself sexually, to identify her needs, to take pleasure in serving his needs and to get him to satisfy hers.
They were married for sixteen years before Stan died and had never settled into any kind of sexual routine. They were constantly experimenting and exploring and, as a result, Helen knew very well what she wanted from sex. God, she had loved the role playing; and how she missed the sheer phyical abandonment she'd developed in their intimacy.
And how hard it had been to find any kind of sexual fulfilment after Stan's death. The couple of times that she'd sought sex through dates had been so remarkably dissatisfying that she'd despaired of ever meeting a man who could provide what she needed, especially now that she was approaching 40.
Her son Eric was a quiet young man without many friends. Helen knew that she was more protective of him than she should be, but needed the close relationship they had. She had been thinking for some time about seducing him - after all he was a good looking young man. Helen was sure he was ready and, anyway, she had been sexually active at his age.
And wouldn't it be better for a vulnerable boy like Eric to be introduced to sex by an experienced woman who cared for him and could ensure he learned more than just the basics?
Her little display in the bathroom had left Helen feeling more than a little horny. Her nipples were still stiff from the massaging, and her labia were damp with arousal. She waited a few moments, rehearsing the scenario she had planned in her mind in the last few weeks.
She then padded down the hallway, paused outside his closed door, then quickly opened it and walked in. Eric was on the bed wearing only a t-shirt. He'd been wanking and was now frozen, mouth open in shock, one fist tightly gripping his hard cock. Helen stood with her hands on her hips in obvious disapproval and, as Eric tried to cover himself and started stammering something, she was gratified to see that his cock, like Stan's, was both thick and long - at least nine inches she judged, her nipples hardening even more.
'So this is what you do on a Sunday morning!' she said, allowing a little anger into her voice. 'First you spy on your mother in the shower and then you slink in here and masturbate!' Eric was almost crimson with shame and started to stammer again. Helen cut him off abruptly. 'Don't you think it's wicked and unnatural to carry on this way? Don't think I haven't noticed you leering at me! Do you think I want to be a victim of my son's lust in my own house?'
Eric was abject in his embarrassment and had finally succeeded in covering his groin with a sheet. Softening her expression from anger to pity, Helen went and sat on the bed. Putting her hand on her son's arm consolingly, she looked at him with concern.
'I'm really sorry, mum,' he mumbled.
'Why did you do it, Eric?' her voice a little less angry. 'You've got to realise that it's wrong to sneak around perving at women. It's going to get you in real trouble.'
'I was just curious,' he mumbled again.
Helen paused as if thinking deeply. Then she said, 'Do you think about sex much, Eric.'
'Uh, sure,' he replied.
'Do you masturbate much, Eric?' her voice gentle, almost concerned. She had leaned a little closer and the neck of her robe had opened enough to allow him a glimpse of one breast.
'Uh, not really,' he said, trying unsuccessfully to ignore his mother's inadvertent and tantalising display.
'Once a week?' she enquired, noticing his cock moving against the sheet.
'Uh, sometimes more,' he confessed in a shamed whisper. Yeah, a hell of a lot more, thought Helen. More like five times a day to judge from the sticky tissues in his waste bin.
'What were you thinking about just now when I came in the door?' No answer. Helen stroked her son's arm soothingly and leaned closer saying in a concerned coaxing voice, 'Were you thinking about me?' Her robe was now open enough at the neck for her son to see both slightly swaying breasts with their hard nipples.
'Uh-huh,' Eric half grunted, looking down at the sheets, his face crimson.
'Look at me Eric,' Helen said quietly. He didn't move and, taking his chin in her hand, she tilted his face up to hers, noticing how his eyes lingered on her tits, and said in a firmer tone, 'Look at your mother when she's talking to you.' Eric couldn't hold her gaze and as his eyes moved away she tightened her grip. His eyes darted back to hers, a hint of fear in them. 'Tell me exactly what you were thinking, Eric, as you were masturbating.' The tone of her voice and her look demanded a response and her son swallowed awkwardly.
'You need to be able to talk to your mother. If I know what the problem is, I can help you. That's what mothers are for.' Eric nodded and, releasing his chin, Helen continued in a firm voice. 'Now tell me what you were fantasising about just now.'
'Uh, I was thinking you were in here with me, mum.'
'Yes, go on.'
'Uh, that's all.'
'What was I doing?' Helen asked gently. 'Was I naked?'
Eric reddened again, and looked down.
'Eric ...' Helen said in a warning tone.
'Uh, yeah, you were naked like just before in the bathroom.'