It wasn't until much later that I found out what triggered the events that led to me becoming my stepmother's plaything. It was one of my regular late night gaming sessions that, as often happened, flowed on into a late night porn session.
I must have been careless and not closed my door after taking a quick break to relieve myself; But in my defence, apparently it was well after two in the morning.
My stepmum - Sonia - must have been woken by my quick toilet break, and could see enough through my half closed door to embarrass and humiliate me if she so desired. There I was, sitting at my desk, frantically tugging at myself while watching a particularly explicit scene of a man being forced to drink another guy's piss and cum from his girlfriend's abused asshole. Apparently I came so hard my first spray of cum went over my head, clearly visible from across the room by the dull glow of my laptop screen.
The grooming started the following morning.
I had a late uni lecture and was shovelling some cornflakes down my throat in the kitchen when Sonia walked into the room, fresh from the shower with nothing but a small towel tucked in at her breasts. Sonia is pretty hot: definitely a Milf in almost anyone's language. She's a runner with a lythe, tight frame, small breasts with a shapely arse and legs. She has startling blue eyes, long dark hair, with fine features, but curiously bushy eyebrows.
Seeing my rather surprised look at her near nakedness, she smiled at me and simply said, "Oh I thought you had left already."
I recall tearing my eyes away and staring at my cornflakes while I mumbled something in return. Sonia, for her part, trotted across the kitchen and grabbed a curiously placed bottle of moisturiser.
Turning back to me she then asked if I would mind moisturising her back before I went to uni. Before I could say much, she turned her back on me and pulled the towel down, exposing her naked back. With an uncomfortable bulge growing in my pants, I stood and gently did as instructed, rubbing in the white cream into her smooth naked back. She then just walked away, leaving me to my rampant thoughts and uncomfortable situation.
The next event happened after her run a day or two later. I was bumming round watching TV when she returned from her run in her active wear. I tried not to watch her bottom as she walked past, but the memory of her near nakedness was playing on my mind almost constantly. To my surprise, after the shower turned off, she appeared again - this time in a G-string and bra. With a sly grin, she presented me with the moisturiser again and turned her back to me. With great care I again did my duty, before she turned around and very deliberately looked at the tent in my shorts as she thanked me. I felt mortified - just a horny late teen, who can't control his thoughts or his porn habit.
This teasing carried on for some time, making my porn addiction even worse than it already was, my mind constantly full of thoughts of sex and a desperate need to screw my new mum. When we were alone, she would wear skimpier clothes than normal and stare at me, looking for any movement on my pants. She would suggestively announce her need to pee, and often left the shower door open when she cleaned up after her fitness routines. Not that I noticed, but several times as I jerked myself off, my stepmum was gazing on.
My dad travels a lot for work, and it must have been his third trip since all this started when the dam broke. I was in my room, slowly masturbating to a video of a guy eating a woman's ass and drinking her squirt while another woman was fucking him with gusto. My dick was rock hard, and dripping with pent-up precum and spit.
I had no warning, just a sudden, "Do you need a hand with that?"
I just froze. My brain wanted to find some pants and turn off the porn at the same time, but it simply overloaded and shut down in embarrassment.
With horror, I felt her presence close behind me, and she slowly spun my gaming chair round so she could see me sitting there stark naked, my wet cock growing limp in my hand.
