James and Severus has had rough patches before. An arranged marriage is a coin toss and they weren't so lucky. They were in love in the beginning, or Severus most definitely was. That's why they had this agreement. But James seems to have fallen for his husbands best friend. Severus will do anything for Regulus but he is not willing to forfeit James. And no matter how much James wants to love Regulus, it will never match how much he feels for Severus. ( Muggle AU, angst, infidelity, it's another arranged marriage story, open marriage drama 😱)