Scott:
He realized after you defended him from Jackson. Jackson was saying how he can't get Allison because he's a loser and Allison is like him and Lydia when you said
"Like you? So you are saying he isn't a jackass? I think you need to rethink what your going to say when you are trying to make someone feel bad. Come on Scott."Stiles:
He realized when you where there when he made the shot at his lacrosse game. You held up a sign that said his name along with Scott's since you are Scott's siblingDerek:
He realized when you and he were fighting Ethan and Aiden. He thought he lost you. He saw Aiden knock you to the ground and start clawing at you but then Ethan attacked him and he didn't see you where he last saw youLiam:
You helped him when he wolfed out. Scott wasn't there yet so you where helping him.
"Okay, Liam, breath. Umm...okay you remember what Derek said 'Alpha, Beta omega' say it with me"But it didn't work so you tried another
"okay, what was Brett's? Umm...Liam, what three things can not long be hidden?""the sun, the moon, the truth."
As you two repeat the words Liam slowly turns back into himself. And when he was human he looked at you realizing he liked you.
Theo:
For Theo is was when he was being dragged to hell. You guys where best friends you were younger and seeing you not help him get out of hell hurt him. And that's when he realized he had feelings for you
Aiden: When he was dying. You tried to take his pain along with patch him up. And he realized he liked you
Ethan: When you here thier for him when Aiden died. You would always check on him.
Jackson: He didn't have to realize. He knew of his feeling for you since sixth grade but didn't want to show them
Issac: You offered to let him stay at your house when you found out that his dad was beating him. And seeing you so worreid, and caring towards him made him realize he had feeling for you.