City of Bones
How we cite our quotes:
"[Parabatai] means a pair of warriors who fight together—who are closer than brothers. Alec is more than just my best friend." (6.52)
Alec is to Jace what Simon is to Clary. The object of their affection loves them, but only in a familial way.
"The most terrible things men do, they do in the name of love." (7.84)
Maybe that's why The Supremes command men to stop in the name of love. But in all seriousness, this moment tells us that besides revenge, there's one other clear motivator in this book: ooey gooey, hearts and flowers, rainbows and unicorns love.
[Jace's] hands were cool on [Clary's], and she was aware of them in a way she had not been of Simon's. (10.121)
Jace's hands may be cool, but their relationship is heating up fast.