My parents split up when I was nine years old. Although they had never been married, they fought it out in the courts after their separation anyway. It was a bad move on my mom's part. She was a waitress at a truck stop, barely making ends meet. My dad was a successful small businessman with a home, a new car and more than enough money to buy a lawyer capable of making her seem like the absolute worst mother on the planet. And he did.
In the end, mom didn't get a thing and lost me in the bargain. While she moved on with my two older sibs (who weren't my father's) I stayed behind.
It wasn't that bad. At least it wasn't until Valerie showed up.

Valerie worked as a secretary for my father at his office. He owned some rental properties around town and she coordinated his business. Which units needed repairs, whose rent was paid in full and who was due for an eviction notice.
I'm not sure when they began dating, but I knew I didn't like it. For one thing, she was bat shit crazy. Valerie was tall for a woman, a full head taller than my dad who was 5'6'' and she was built pretty solid, though not fat. Maybe slightly chubby and big boned as they say. She had long slightly curly dark brown hair and she wore coke bottle glasses which made her blue-green eyes look enormous.
As soon as dad moved her into our house she assumed total authority. And we butted heads constantly. She'd tell me to clean my room, I'd tell her she wasn't my mother. If my dad was home, she'd produce a few crocodile tears and go sobbing to him. If he wasn't around, she'd laugh and go on about how thankful she was for that and how when my dad kicked off someday she'd get everything and not me. Truth was I didn't give a damn.
But she was bipolar and as often as we fought, there were also times when she genuinely seemed to like me and went above and beyond to make me like her.

I can remember the one night in particular that started it all...
I was twelve and going through puberty. It had come to me late, but when it came man oh man it came like a hurricane. I was horny every second of the day.
It was about a quarter past midnight and my dad wasn't home yet. Some weekends he liked to stay out with his Masonic lodge brothers and drink a while.
My bed time was 10 o'clock, so I'd been in my room a couple hours. Bored and wide awake, I was lying still in my bed staring up at the ceiling. That was when Valerie opened my door and peeked in.
"You still awake??" She asked.
Here it comes, I smirked. She's gonna bitch about my not being asleep yet.
I didn't say anything, just kept staring up at the ceiling. So she walked in, closing the door behind her. She was dressed in blue silky nightgown dad had bought her. It was sheer and even in the dark you could see her bra and undies.
She sat on the edge of my bed, smiling. I could tell by the tone of her voice she was in "nice" step-mom mode.
"I can't sleep either," she smiled. "I don't think I should read my scary books before bed. You ever read Stephen King??"
"Nope," I said.
"How about um.. R.L. Stein, is he the one you kids like??"
"Goosebumps is for babies," I replied, still in no mood to be friends.
"Yeah you're right," she said, "you aren't that little anymore."
We were both quiet a moment. Then she leaned toward me.
"We can be friends you know," she said. "We don't have to hate each other."
I didn't say anything.
"You know what they say," she smiled. "A boy's best friend is his..."
"You aren't my mother," I interrupted her.
She sighed.
"I know. But I can be your friend," she smiled again and put her hand on my stomach, slightly below my navel. Which was too close to a certain part of my anatomy. I couldn't help it. I got hard, fast. She noticed.
"Woops," she laughed.
"Augh," I pulled my pillow over my face. She laughed harder and pulled it back down.
"I'm sorry sweetie, that was my fault," she said, now rubbing my tummy. "You know, if we were friends I could take care of that for you.'
I looked at her. "What do you mean??"
She shrugged. "Just saying, there's benefits to being my buddy and not giving me a hard time. If you're nice to me, I can be real sweet to you."
I still wasn't sure what she was talking about.
"It's tough for boys your age," she said thoughtfully, still slowly rubbing my tummy. "You're becoming a young man and your changing in lots of ways. It'd be nice to have someone around to help you get through those changes. Make it a little easier, wouldn't it be??"
"I guess," I said.
She moved her hand down until it was directly on my hardon. "Do you like me touching it??"
I did indeed. I said as much.
She rubbed it gently, then reached into the pee hole on my pajama bottoms and pulled my cock out, holding it in her hand, running the tip of her thumb around the head.
"Does that feel good sweetie??"
"Yes."
"Are we gonna be friends from now on??"
I nodded. She smiled. "Good."
She lowered her head and started sucking my hard on. My eyes rolled back in my head and I arched my back slightly. Oh jeezum crow did it feel good. When I shoot my load into her mouth she swallowed it all, then milked me for the dregs and ate those too. When she was done, she kissed me on the forehead and left the room.

The next day dad was outside mowing the lawn and I had just woken up. Still in my PJ's I made my way to the kitchen and saw Valerie standing at the sink washing the breakfast dishes. She had on a floral print top and jean shorts she'd cut herself. About an inch of her butt cheeks were hanging out either side. I walked up behind her and groped her. She started and whirled on me, her eyes were crazy and she was holding a huge kitchen knife that she'd been washing.
"What the hell do you think your doing??" she growled.
I backed up "I...I...I..last night..."
"You had a fucking dream," she told me. "Don't ever touch me like that again. Understand me??'
"Y-yeah," I stammered, backing out of the kitchen.

Yet, a couple of nights later she came to my room again. Dad had gone to bed early and she had set up reading, now she was in my room again. "Hey, you awake??"
"I don't know," I said. "Am I dreaming again??"
She pretended to not know what I meant, or maybe she really didn't. She was in her short shorts again.
She sat on the edge of my bed and reached for my crotch.
"You're hard again," she smiled.
"Yeah, it stays that way," I told her.
She rubbed it gently and stared at me. "You like my shorts??"
I nodded.
"Want to feel my ass??"
She stood and turned around. I reached for her, stopped, reached again, stopped.
"It's ok," she said.
I felt her ass. It was so warm and soft. I heard her unzip the front and the shorts dropped to her ankles. She didn't have on any panties. I ran my hand across her entire rearend, growing so hard my erection became painful. After a minute or so, she pulled her shorts back on and sat back down.
"You like my ass??"
"Yeah."
"I bet you'd like to fuck me in the ass wouldn't you??" She giggled. I nodded.
"Want me to suck it again??" I did.
She gave me head, I came way too soon for my tastes and she was gone.

It continued like that for most of a year. She'd visit me at night and we'd have our little sex games, then the next day she'd have absolutely no recollection of it. Eventually we had actual sex. She straddled me on the bed, then sat down on my lap and rode me until I came.
Unfortunately for her, my dad who had never been a particularly loyal significant other began screwing yet another of his female assistants. When Valerie found out she went ballistic and chased him through the house with the same knife she'd pulled on me. I had to lock my bedroom door and shove my dresser in front of it. I hid until I heard the police sirens and then I heard them come into the house and tackle her, all the while she ranted and screamed. I never saw her again. As for dad, I guess he was good at staying out of her range. He didn't have a scratch.

Dad would continue seeing different women, but Valerie had fixed him of moving any more into the house. That was more than fine by me, but there were nights I missed having that crazy amazon bitch around.