in secret
Camille Raquin

24
Camille is the son of Madame Raquin and grew up in the French country side with Thérèse who was his cousin. When they're adults his mom makes them marry each other. Thérèse, however, did not love Camille. The three family members move to Paris so Camille can find a job and he eventually begins working for a railway company and meets his childhood friend, Laurent LeClaire. Camille brings Laurent home to meet his mother and Thérèse, and to participate in a weekly dominoes game. Thérèse and Laurent fall in love and meet secretly in her bedroom without Camille or Madame Raquin from finding out.
You are Laurent's sister who he brings to the dominos games and you fall secretly in love with Camille. (But he doesn't know.)
(Don't mind the voice. -_-')