I wiped the sweat from her brow. Then I slowly shook my head. She looked at me, slightly more frustrated. She is 49 and I always saw her as attractive but I had never seen her in a sexual way before. I have been married for seven years. My wife is 26, I am 27 and we have a son of four. I had the best sex of my life that night and we carried on all weekend. For the next week we had the hottest affair ever but then we agreed it was wrong and stopped. I got home early on the Saturday and heard noises from upstairs. I went up and my mother-in-law’s bedroom door was ajar. Tell your wife that you miss having sex and ask her what you can do to help her regain her interest.

Her face fell. "Oh... Adam please..." she began to beg. It wasn't desperate begging. It seemed almost playful, though it was still begging. I turned off the TV and sat for a moment, contemplating what I might do next. If I untied her, the fun would be over. I feared she might even punish me for stripping her down so much. I needed to make her enjoy it but also show her who was in control. If tonight went well and she enjoyed it, I might be able to do it more often.After that I fantasised about her all the time and would sneak a peek at her in her undies or in the shower whenever possible.

My step-mother had had a very frustrating day. She'd failed a job interview (again) and was worrying about the state of the marriage. My father was out on a week-long business trip. Lately, they'd both been drifting apart and for me it had awoken memories of him and my mom before the divorce. That day, she'd come home from work and was sitting on the couch in the living room, reading a magazine. I looked at her up and down. Part of my conscience was urging me to untie her and face the consequences. Hopefully I could convince her not to tell Dad and we would put this all behind us. But the other part... Three months ago my wife took our son to visit her brother. I don’t get on with him so I stayed at home with my mother-in-law for the weekend. That was definitely exciting..." she said. "But the clothes... you shouldn't have done that. It's not right." No, but I would like to try it out." She looked at me firmly. "Tie me up. Not too tight. Untie me immediately if I tell you to. And don't do anything... extreme."

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I went down to her legs and untied her ankles. She looked slightly surprised as I let her legs free of her bonds. She tested the freedom I'd given her, stretching her legs for the first time in over an hour. I moved up her legs and felt the edge of her panties with my fingers. She gasped as I slowly pulled them down her thighs, past her knees and took them off. They were soaking. Too far?" I said, sitting down at her feet. I looked around at where I was. Clothes strewn about the floor, a vibrator by the foot of the chair, the beautiful woman tied up willingly. "You draw the line at this?" At 35, she was 10 years younger than my dad was. Unlike the rest of my family, she was a brunette. She was also incredibly curvy, regularly visiting the gym. I had never really seen her as much of a mother. She was more of an acquaintance who happened to live with me because of family connections.