I had coveted my mates wife from the first day I met her.  Rosa was sexy, smart and really good looking.  I was pretty sure that Ernie knew I wanted her.  So it surprised me when he asked if I could help with a repair on a piece of electro-mechanical equipment for her.  What he didn't tell me was it was a Sybian, yes a vibrating cock on a sort of saddle.  I could see the mischievous look on his face when he dropped it off at my workshop.  He said he wasn't surprised that she had broken it as the dirty bitch spent so much time riding it.  He said he hoped I could repair it as a replacement cost a fortune and it was an essential piece of equipment.  I thought his comment was a little strange but assured him I would do my best.    As I started to work on it I had an instant erection knowing what it was, and that erection was strengthened by knowing that Rosa would be impaled on the cock and enjoying the buzzing and movement of that cock.  I was almost tempted to sniff the cock and saddle.

How I wished I could replace the Sybian and Rosa sit on my cock, or even my face would do.  Ernie had left me looking at it.  It came apart pretty easy and as soon as it did I could see the reason for it's failure.  Three parts had broken.  Two were metal, but the third was a plastic helical gear.  I could easily make the metal parts but I had no way of making the plastic part.  There was a makers name and phone number on a label inside the case and I tried ringing it and got a woman who was pretty annoyed as the company had gone out of business and she often got calls for them.  She almost screamed at me that she didn't make sex toys and to bugger off.


I had a mate who had a Three D printer and took the part to him.  He scanned the broken part in and rebuilt the broken area on screen.  When he went to start it printing he got errors flashing on screen.   After a short play he told me to leave it with him.  I went back to my workshop and started to make the other two bits.  Next day Rodders had made the gear and I went to collect it.  The gear part was thicker and the guide part in the helix was slightly deeper and wider.  Rodders told me that was the best his cad package could do.  As it wasn't quite like the original so he charged me for just a little for the material used in printing it.


Back in the work shop.  I found that the new gear fitted ok and made the cock swivel and thrust a bit quicker and deeper than the original, but not by much, so I finished the reassembly and secured the case.  I rang Ernie to tell him it was repaired and he replied, "thank god for that, perhaps I can get some peace now."  He told me it would be collected a while later.  I few hours later Rosa was at my door telling me she had come to collect Henry.  She had a name for her mechanical cock.

I asked did she want to see it working.  The smile on her face said she did and I turned it on in the slow position.  The cock head rotated a little as it gently thrust and buzzed.  Rosa took the controller from me and wound all three settings to just over three quarters of the way up and said that was her favorite position.  The cock was moving around and up and down at a pretty aggressive pace and it was buzzing pretty loudly.  


Then I couldn't believe my eyes as Rosa turned it off and reached under her skirt and pulled her pink panties off.  Throwing them on the floor she straddled the cock and impaled herself on it and restarted it at a slower speed.  Over a matter of two minutes she wound it up to what was her favorite position and within seconds she was flailing her arms around and coming.  I could see her legs shaking as she rolled off the machine onto the floor.  Her shirt had fallen awkwardly leaving her pussy completely exposed.  Even her pussy was convulsing.  Before she could say no or move I was between her legs licking at her pussy which seemed to prolong her orgasm and spasms.


It must have felt good as Rosa had moved her hands onto my head and was holding me tight to her trembling pussy.  .  Then as she came down from her orgasm her hands relaxed and her fingers were running through my hair.  She was telling me just how good it was and how much she had missed Henry.  She said he felt faster and stronger then she remembered him.  Up to that point I was still licking her pussy, but thought that I ought to get off of her now and as I went to stand up she could see that my cock was stood up and straining in my trousers.


"Did I cause that?" Rosa asked with a grin, knowing full well that she had, "Let me take care of it for you."    I couldn't believe just how quick a woman can get a man's cock out when she wants it.  Rosa sucked around the head a few times sending tingling throughout my body before engulfing my whole length into her mouth and throat.  I defy any man to take much of that treatment without coming, and come I did straight down the back of her throat.  Rosa licked my cock  clean and said she hoped I had enjoyed that.  To which I just grinned like a Cheshire cat that just had the cream.


I was expecting Rosa to replace her panties and take her toy and leave, but she declared that my coming in her mouth had made her horny again, and poor Henry was placed into service again.    Seeing Rosa riding and building herself towards another climax caused my cock to respond again.  As she rode I took the controller from her and slowly turned the speeds to the maximum.  Rosa was squealing and groaning in equal measures.  Her arms were flailing around as she trembled everywhere.  Then she all but fell from the toy and was convulsing wildly from head to toe and still groaning through her pleasure.


As she trembled I climbed on top of her and slid my cock in deep and started to try to replace Henry although there was no way my cock could gyrate like his could.  The rotation didn't seem to matter as Rosa was thrusting herself up to meet my cock.  Her hands were on my arse and pulling me in deeper with each thrust.  Then her trembling started again and her pussy was getting tighter.  She was groaning very loudly and instructing me with groaned instructions not to stop.  I kept going as long as I could before coming again but in her pussy this time.


I rolled off her and lay gasping.  Rosa had a faster recovery than mine and was back on Henry for yet another ride.  I was almost feeling sorry for Henry with the workout he was being put through.  Once I had recovered Rosa told me to stand by her head and she was quickly sucking my limp cock.  Having come twice in a very short period of time, there was no way I was going to get hard again very quickly so I just enjoyed having my cock rolled around her mouth by her tongue.


I had to move away as Rosa got more and more worked up by Henry fearing she would  accidentally bite my cock as her sucking got harder and more erratic.  Then she was coming yet again and convulsing like mad as she fell from the toy.  I was getting concerned a the convulsing was beginning to look more like a fit.  Then it subsided and she was laid panting and gasping.  When Rosa  finally had gained control of herself again, she thanked me for my service.  To which I told her she could come again any time not realizing for a moment what I had said.  Rosa replied that she most certainly would.


She looked at her panties on the floor and told me I could keep those as a memento.  I carried the Sybian out to her car and put it in the boot of her car.  Then she was in her car and gone.  A few days latter I met up with Ernie and over a pint he asked me what he owed me.  With a grin I told him no charge as it was my pleasure to help out.  Ernie grinned back at my grin and said that now I knew what he and Henry had to endure.  I told him I was more than happy to help out at any time.  I could see from Ernie's face he was happy for the help.