Video games (фемслэш)

Sansa knew a lot of things about Margaery. For example, she knew that she had recently become obsessed with video games, much to her annoyance. She also knew how Margaery was delighted when her parents bought a summer house in Winterfell, because she loves spending summer breaks with her. She also knew how Margaery spent most of her time in the Starks' place, because why not?
Other things Sansa thought she knew. Like how it felt like Margaery was into one of her brothers, although she hadn't said a word about it. Sansa could be okay with the video game stuff (it was hard, but she was trying) but... she wasn't okay with that. She should be happy about it, right? Her best friend and her brother? Why not? But she could not... and she would not.
The reason? Not yet discovered. But Sansa had a whole summer to find out, didn't she?