Ethan: You wouldn't really be able to tell it was flirting because it'd be realllllly lowkey and awkward. "So, do you like stuff?" "Probably should go eat...together I guess."
Zion: It'd be straightfoward and he'd let you know how he feels immediatly. The flirts would also be NSFW and embarrassing ;). "Yo, nice cheeks.", followed by him smacking your butt.
Harry: His flirting is just constant compliments. He wouldn't be self aware either. It would all just be really genuine. "I enjoyed spending time with you."
Eugene: He would be awkward also and really discombobulated. When you wouldn't get the flirting or flirt back, he would just get mad and walk away. Also there would be lots of staring then looking away when you notice.
"Nice hair today, heh"
"What?"
"Nevermind."
Lawrence: His idea of flirting is really corrupted. At first, he'd seem really nice but when he's not around you he's lowkey stalking you.
"Who's your friend?" He asks after walking up to you.
"Oh no one." You say.
"Mm...it'd be a shame..if anything happened to him..."