Diabetic Dad Doesn't Do It

I am sorry, I am sure many readers on here are going to dislike this post. I never went to Uni I went straight to a junior job in a large car dealership in the UK. I am 22 have a top of the range German car and can pull a girl when I want one. I often dont have Sundays off because I am greedy and like closing sales and the weekends are the most lucrative.
I was off about a month ago in bed looking at some milf porn on my phone when I heard my folks having sex, it started ok and I was having a tug listening to it, all of a sudden, I hear my dad say sorry this isn't working, my mum tries to encourage him and next thing he's out the door with the dog walking off his frustration.
I hear then as the door closes my mums bedside drawer open and the power of her vibration toy thing actually makes my phone crackle.
I then have a glorious wank thinking of my sweet mum, who's someone most guys any age would love to fuck but not a Milf.

Then it happened again a week ago in the middle of the night, this time dad left mum high and dry while he took a shower, the same toy of hers upset my phone but gave me a hard on.l thinking about my mum playing with her pussy.
Mum is 53 size 12 lovely tit's and a big enough ass, she dresses very conservatively, but her underwear and toys reveal a different side to my parents, poor mum.
Well I am a salesman first and foremost and taught to recognise signs and now days learn an awful lot of psychology.
So ever since dad couldn't get it up for mum last month, I have been flirting with her and she has loved it and flirted back, I have commented on her dresses and said how summery she looked and reminds me of Doris Day, one day when dad was bowling we had a water fight in the garden, her dress didn't reveal anything but her ripples grew on her 36c breasts.
Anyway yesterday morning after being out Friday night dad got brave and tried to bang my mum, sadly for dad the prescription isn't working. He got frustrated and Ruby our labrador had a early walk again.
As soon as the dog and dad were in the car, I didn't give mum a chance to fuck her self with her wand.
I moved in I am slim 6ft much taller than my dad, I work out and my cock is an average 6 but its stiff like iron . I going parents room mun quickly put her phone under the covers and I know that my mum can't but help see my hard cock tenting through my light shorts!
Mum im so sorry , you need to get him some help, and then she burst into tears. I then pounce I jump on the bed holding telling not to worry things will be OK, all the time I am smoothing her back and her tit's are pointing then I see she has no panties on answer has a landing strip glistening with her juices.
Fuck it it has Sale written all over it I kiss her cheeks gently then her neck then I lower my mouth to her nipple. Good old mum she's definitely interested she wants to buy and grabs my cock.
Shes keen that's obvious I take my shorts off and stand on the mattress towering over and she kneels up on the bed and sucks my cock.
There is no doubts, time to cool off , I have timed it just right. I push her away and signal for her to lay on the bed and we are soon in the 69 position and within no time at all my mum is pissing juices into my mouth . I am about to cum but I want it right in the hole I came out of 22 years ago and so does she, she is fucking hot and horny, so energetic the beds creaking and she's as noisy as hell and we both cum.

We are silent holding each other panting and she says thank you baby.
I've been reading about diabetes and I say mum why dont you wank dad off or let him wank off. Hes concentrating to much on pleasing you, just get him to accept he probably can't fuck you any more. You can use your toys and I'll give you the best sex I can whenever dad's not around.
Amazingly she's agreed to the deal.