Imagine: This is how Luke is with you
Luke would be really clingy with you, he would always want to be in contact with you whether it's holding hands, grabbing you around the waist cuddling in the couch, him sitting next to you with his legs slightly touching yours. Luke would want you to know how much he likes you and wants everyone else to know too and he would talk about you with nicholas and sam when ever your away. He sometimes would be a little show off by giving your butt a squeeze just to get a reaction out of you or maybe sometimes just to hear you laugh or see you roll your eyes.