You are doing a test and focusing very hard, you take a break and look up, the quiet guy no one really talked to was staring at you but once he met your gaze her looked away

you go back to your work and eventually finish the test only to see that killua has moved seats while nobody was paying attention, he sat right next to you

Killua: hey uh... I don't know if you get this a lot but uh... You're really beautiful he smiles warmly