Sam~ that you actually care about people and things.Your not some person who doesn't care and do bullshit stuff.He loves someone that has a true heart and that's why he pick his one and only (y/n).

Dean~ stand up for yourself.Likes to see the toughness in you. Although he still going to protect you,makes him feel good to have something strong in his life.

Cas~ give him hugs and kisses.It makes him feel welcome,and that he know that he has something  he can love.