"Becalmed" was from a meme where a woman is shown putting her hair up and the tagline is "When he says nothing can make him feel better."
"Coming in Third" started with the memory of one of my buddies pulling off the mother/daughter hat trick for real, and the line near the end where the MC says "Tell your mom I said hi."
"You Serious?" is another meme start where it says "When you let your BF fuck your bestie because she's been single for a long time and you know we all have needs" and a picture of three in a bed where the one girl is reading a book and holding hands with her friend while her BF rails her.
"A Sale of Two Titties" comes from the title, which comes from a Monty Python skit. A lot of mine arise from a giant file of wordplay/pun titles.
My latest, "Catbird Seat" starts with looking for an idea for the Facesitting category. I started doing searches for phrases related to sit, seat, etc. That one popped up, the concept of the no pets popped in my head, and I was off to the races. I had to tweak it because it originally started with Alexa as the property manager's daughter, and that put too much of an air of real power dynamics that I didn't like. In the final version she thinks she has all the power, but in reality she's got no leverage, and they go along with it because it turns them on.
Not here and little chance it will be, because it's Sci-Fi/Fantasy and 100k words long, but "One Whore's Town" is another title start. Let me take a peripheral character from another story and give her a starring role in a tale of two prostitutes in a turf war that gets out of hand fast.