PDA - Public Display of Affection

Alec: You weren't really into being 'touchy feely.' It never crossed your mind, unless you would get into one of your lonely moods and seek him out to cuddle. You would occasionally hug or kiss his cheek, but you mostly just held hands. However, even though Alec got shy, he would always look for an excuse to touch you. Jace and Izzy loved teasing Alec about how he was clingy. You thought it was cute, but you weren't always in a touching mood. 

Jace: He didn't really care about showing anyone you were his, because he knew. Sometimes (usually when he's had a bad day)when he needs you more than usual, he'll pull you aside and hug you tightly. Whispering about what was making him upset. You would rub his shoulders and hide you face in the curve of his neck, kissing him lightly. Every one would wonder if you two were still dating and not just friends, but soon they realized someone was in bed with Jace!

Magnus: He can hardly get his hands off you. Not because he was worried someone would take you (he knew you loved him) but because you were always so damn irresistible. He thought you always looked so touchable and he always wanted your attention. Some people thought it was cute you two were so close. Others told you to get a room!

Simon: He loved kissing your cheek, holding your hand, and hugging you, but he also just loved looking. You often found him staring at you, especially when you were talking with other people. You decided to do the same, staring at him whenever you weren't directly talking. It became your 'thing.' You both would meet each others eyes and try to guess what the other was thinking. Clary always told you two you were adorable, others found it creepy.