When I got married, I got a wonderful step-daughter in the deal.  At the time, she was a 12 year old skinny girl and sweet considering what she had been through.  I never gave her a second thought sexually.

After she graduated high school and started college (still living at home), I started taking notice.  I'm not sure if it was because my wife rarely wanted sex or because my step-daughter had become a hot young woman or both.  At any rate I started fantasizing about her and jacking off daily to pics of her in a bikini.  I couldn't believe how horny I had become for her.  So, I started planning a little surprise.

I knew her study schedule really well.  She liked to sit on the love seat in the afternoon to read.  I was an avid jogger, and our bedroom door opened in full view of the living room.  I would get home before my wife and say hi to Mary as I walked by to the bedroom.  She knew that I always jogged in the afternoon right after work, so I decided to try something daring and exciting.  I started purposely leaving the bedroom door open a little, then I stripped and paraded back and forth pretending to get dressed.  (always making sure my cock was hard)  After a few minutes (waiting for my boner to subside), I would dress, come out and take off on my jog.

For several days I did the same routine.  I watched for a reaction from her as I left.  She would smile and say, "have a good jog", but nothing more.  Until one day...  It was like the other days except when I came out I could tell her cheeks were flushed and she seemed to be smiling a lot more.  I knew she had seen my hard cock and she hadn't freaked out.  I almost filled my jogging shorts with cum.

The next few days we played the same game only I left the door a little more open.  I was sure she was watching.  She even moved from the love seat to a chair that was closer to the door.  That was my queue to get bold.  The next day, I rigged the door to open all the way.  When I was ready and very hard, I pulled a shirt over my head and triggered the door to open.  She had full view of my hard cock.  When I poked my head through the shirt, I stood there and let her stare at my cock.  I was in heaven.  She never looked away.

I pretended to be sorry, but didn't move.  "I'm sorry, Mary.  I didn't mean to flash you."

She cleared her throat, "It's okay, Rob.  I've seen a cock before.  Yours is nice to look at."

I couldn't stop myself.  "Thanks, Mary!  That's really sweet of you."  I pulled my shirt off and walked into the living room.  "Would you like a closer look?"  I was on shaky ground, but so horny I couldn't control myself.

She hesitated and looked to the front door.  "Uh, yeah, I would like that, especially since you are already here."  We both laughed a little.

I couldn't stand it.  "I'm about ready to cum.  Would you like to watch?"

"Yes!"

Without another word I jacked for less than 2 minutes and blew my load all over the floor.

(more to come....)