The sister-in-law is the bottom. Bottom-led story.
After her husband died, the bottom treated her late husband's twin brother as a source of comfort.
Whenever the bottom's lips closed around him, the top often wondered:
Who was his sister-in-law kissing right now?
His late husband's younger brother, or her new lover whom she had seduced?
...Or was it a third person wedged between him and his late husband?
Outside the window, rain blurred the night, just as the bottom's body had been wet the night they first met.
When they first met, the bottom took off the slender high heels hidden beneath her trousers, slowly used one as a bottle opener, and poured herself a glass of red wine.
The top turned away, but all he could think about was his sister-in-law's lips, glistening with wine.
He thought, no wonder he and his big brother had been born as twins.
Even their tastes were so alike.
The bottom treats the top as a stand-in.
Theme: Face your own psychological problems
