Ashton:
I don't think Ashton would be ridiculously obvious about it but he also wouldn't let you go unnoticed, once he'd spot you he'd find it hard to take his eyes off of you and every time there was a break he'd give you that leg clenching look that made you want to rip off your clothes, run on stage and let him take you on his drum set in front of everyone.
Calum:
Calum would be almost shy about it, it made him feel pressured to be his best knowing you were there watching and when he sees you he can't help but break out into that ear splitting smile that makes his cheeks look all chubby and makes his eyes crinkle up and he would have to turn around and do a little run on stage to remind himself to get the words right and not just stand and smile at you.
Michael:
Michael would be the blatant type, when he'd spot you he wouldn't give a crap who knew it and he'd wave wildly like a proud child on stage at their very first performance, he'd make sure to pull funny faces at you and wink a lot and he'd absolutely love seeing you rock out to his songs. Throughout the performance of Wrapped Around Your Finger he would make heavy eye contact, the kind that made you have to cross your legs to fight the urge to jump him and make him push you against a wall.
Luke:
I think would be a mixture of everything, on the one hand he'd love seeing you in the crowd and would give you an awkward wave as he chewed on his lip and ducked his head in embarrassment and he would constantly chew on his inner lip to fight breaking out a huge smile everytime he laid his eyes on you but then there was the other part of Luke where he would be midway an intense solo and he would lock eyes with you so intently that your heart would literally wobble inside your chest and you knew he was thinking about what you guys would be doing after the show.
