A wife and mother is brokenhearted by her husband's request for a divorce. An aging, black stranger takes advantage and greedily worms his way into her life. However, her continuing attempts to resist slowly strengthen her resolve. Will she eventually free herself from his domination? (I abhor racism in the real world, but I don't object to using a fetish trope in a sex-fantasy. The primary person of color is just a bad dude unable to cope with his troubles. His color has little to do with it.)
A groom gets dumped at the airport when his new wife runs off with another man before their honeymoon flight. Heartbroken, he asks his mother-in-law to come along instead, and she reluctantly agrees.
A dominant woman moves in with her younger sister and brother-in-law. She takes control of the husband almost immediately and then extends that control to her sister. The wimpy husband is locked in chastity and turned into a cum-eating slave. His wife experiences black cock for the first time.