Need help finding a story (Please Help!)

[Rembrandt_Pussyhorse]

I'm looking for a story in which a mother catches her son jacking-off into one of her bras, then convinces her son to collect his cum for her to use as a moisturizer for her ass, even going so far as to have her oblivious husband apply it before bed every night. Eventually they just resort to having him jack-off directly on her ass, and after a while, they finally have sex. I believe the mother was described as having dark/olive skin and a round ass, and the son has a large cock and cums in copious amounts. I also believe the words luxury or moisturizer might appear in the title.

I hope my description is detailed enough for someone to identify it. I've had no luck finding it, so any help would be greatly appreciated.