Grounded and bored at home two days ago, I didn't know my step dad had arranged for our heating system to be checked. Masturbating on my bed using a vibrator and my fingers, I was shocked to see an older guy watching me from the doorway. Freaking out, I asked him who the fuck he was. He replied "The heating engineer, checking all your system".

The thing was he wasn't just stood watching, he was stroking his cock through his work shorts. Now this guy wasn't anything special looking, but I was so horny by then and so pissed at my mom (She's very strict) for grounding me, I found myself touching myself and grinning like a Cheshire cat at him. There wasn't any conversation as such, other than him saying "You look so fucking gorgeous". I didn't even say anything when he walked over, put his hand down to my pussy and began to slide his fingers up and down my pussy slit.

He carried on massaging my pussy, and then began to lower his shorts and boxers with his other hand. He was struggling so I began to help him. That's when we both heard "What the fuck's going on here". The guy jumped up and I tried to cover up as we both saw my step dad enter the room. All hell let loose, as my step dad dragged the guy out of the house yelling at the guy and then returned to me. Shouting at me for over ten minutes about being a slut, I finally told him he was only jealous that he hadn't gotten to touch my pussy. My step dad smiled at me and said "I can have your pussy whenever I want from now on, that's if you don't want to be grounded forever by me telling your mom".

Putting his hands down to my pussy, he moved my lips apart then inserted a finger deep inside of me. Finger fucking me for a couple of minutes, I saw the bulge in his trousers and thought he was going to seduce me. Instead he stopped fingering me, licked his fingers and said "Not now, next week when your moms away, I'll be teaching you a lesson. You WILL be sucking on my dick and I WILL be fucking you". Leaving me lay naked on my bed I was so embarrassed, yet so sexually frustrated he'd not gone further. I know from listening to my mom and my step dad fuck, he's good in bed and I believe he's got a big cock. So now in a few days from now my mom will be away and I'll still be grounded.

I could tell my mom everything, but then she'll only say I was the one who was in the wrong. But if I'm honest, I am kind of looking forward to seeing just how good ***** is in bed, and if he'll want to carry on fucking me after our sexual times together next week...