Irresistible

"Maryse and Robert are his parents, Jace is his parabatai, and Izzy is his little sister. They’re obligated to feel something for him, god forbid he becomes the Lightwood’s estranged disappointment, and sometimes Alec feels like that cancels out the fact that they love him. Almost as if they only love him because they’re family. He knows that's not entirely true, but sometimes he feels like that anyway. With Magnus it's different. Magnus doesn't have to stay with Alec, for the first time Alec feels as if he has to make an effort to keep someone he likes interested in him. And that scares him, how dependent he's become on Magnus and how willing he is to do things just to keep him around. It makes him feel pathetic. He knows that eventually Magnus will get tired of him, everyone does, and it’ll break his fucking heart."Or the one where Alec's insecurities pile up but Magnus reassures him and then they make out.