Jeanne and Marie have been living together for three years. They met in Barcelona and were instantly smitten, Jeanne having just broken off her engagement with her childhood sweetheart François-Henri. Now, Jeanne dreams of having a child, but the only way she can conceive of conceiving is... well, the traditional way. When her younger brother announces that he's getting married, Jeanne hatches an outrageous scheme to seduce François-Henri and have sex with him one more time... y'know, for the baby!