beta
Actually, isn't her Ex and her sister a dream couple? Hear me out. What's the common hope in relationship? Being accept with your flaws and established rules!
--> Accept the other flaws. (Don’t judge each other despite seeing the other do something bad like trying to get with a taken man. )
--> Consensual openness. (Don't make a scene and get jealous about the other seducing another while they are doing the same thing. Cheating bastard usually hate being cheated on)
They are perfect for each other!
...
All that said. Burn them.