Susan was depressed and thoroughly bored.
Day after day, trapped in the house with nothing to do but play with her sex toys and dream of imaginary lovers who were better hung than her absent husband.
Enter Jeff, the very well-hug Window Cleaner, who opened her up to new sexual experiences, including anal sex, and cuckolded her husband.
But it was when Susan told Maria about Jeff, that Maria introduced her to her lesbian side, made her a unicorn and thus showed her a world of threesomes, foursomes, BSDM and huge cataclysmic orgasms.
And all bound together by Susan's prodigious lactation and the joy she got from sharing her breast milk with her lovers.