She spoke so firmly with such certainty that, for just a moment, Isaac almost believed her. He looked at her and had gone to look away, because that was what he was supposed to do, look away, avoid eye contact, but she was staring at him and holding him there. At first he wasn't sure if she was doing it on purpose, but she must have been, and that was how he knew she wanted him to hear her.
He opened his mouth to argue, because there were so many things that could have gone wrong and so many reasons why that wouldn't have worked, but for some reason in that moment Isaac couldn't think of a single one. She had meant it. He could tell by the way she was speaking to him that she had meant it, and Isaac had never had someone so invested in his well being before with no ulterior motive. Even Derek, who had saved him from his fathers wrath, had done so because he was trying to build his own pack, but Lydia had no reason to offer him help other than, apparently, wanting to. Because she understood. She was the only person in the world who could have understood.
So, instead, Isaac caved. He seemed a little stunned as he stared at her in disbelief, because he was stunned, and maybe that was why it was so hard for him to argue with her. She had caught him off guard.
"I'll try." It was all he could do. Isaac wasn't one to make promises he couldn't keep, but that one he could. "I don't - I'm not sure if I can actually do it, Lydia, but I'll try. Not now, but... after you and Malia have the babies. Then I can try. As long as I'm not alone."