B for boundaries, because Wendy truely believes that Irene didn't know what those mean, or if she did, she certainly didn't care to maintain them. 
 

The earliest example that Wendy can remember happened even before the two were married, which showed truely just how shameless Irene was.

The raven haired girl had just showed up unexpectedly to the friend group's usual Friday get togethers, arriving late into the night despite telling them that she wasn't coming due to a date she had. By that time, the friend group had already dug in to the cakes Wendy had bought from work. Seeing as Irene wasn't going to attend, the younger girl hadn't brought her a cake, which she dearly paid for in the price of her own cake.

"Unnie! That's mine!" Wendy cried out once she caught sight of Irene holding and eating the Red Velvet cake as if it was her own, using Wendy's fork no less.
 

"So?" Irene had replied back in a bored tone, but Wendy swore she caught sight of a bit of mischief in those doe eyes, "you should've bought your unnie one. But you didn't, so now it's mine." She shrugged. 
 

"Unnie!" Wendy whined. She had been looking forwards to eating this cake the whole day after she packed the four cake slices into a box at the bakery, and now Irene was eating it with no remorse. "I thought you were going on a date tonight, so I didn't bring you one!"

"That's true, Irene Unnie. How was the date?" Yeri asked, her and Joy leaning forwards in their seats to hear about it. Irene and Seulgi shot looks to each other, making it clear that the bear-like girl already knew what happened. Wendy felt that familiar jolt of jealousy course through her at the looks. She knew that it's to be expected that Seulgi knew everything about Irene seeing as they're childhood best friends, but the fact that Wendy wasn't the one Irene was the closest to still made the younger girl sad. Sometimes Wendy wondered if Irene even saw her as a best friend or just as a regular friend who's best friends with Seulgi.

"It was terrible, the only thing he talked about the whole night was business and how much our parent's companies could help each other's become better." Irene said with an annoyed sigh.

Wendy raised an eyebrow at that, "I thought you liked talking about those things?"

"At a business meeting? Sure. But to have it be the only topic of conversation at a date? I'm looking for a life partner, Seungwan,