Incest and Cheating Ideas (M seeking F)

List of pairings: (Note: I only play as Males)

Mother/Son(s)
Father/Daughter(s)
Brother/Sister
Cousins
Aunt/Nephew
Aunt/Mother/Son
Uncle(s)/Niece
Husband/Wifes Best Friend
Husband/Wifes Sister
Wife/Husbands Brother
Wife/Husbands Boss
Wife/Boss
Wife/Boy-next-door

I do have plots for some of the above pairings but am also open to other peoples ideas.