Its perfectly normal for an alpha to be clingy to an omega, especially if they are newly mated. But even by alpha standards, Percival takes it over the top.

That is why Newt is awkwardly sitting next to Graves at the international confederation of wizards. Newt can feel the eyes on him, he can sense their curiosity and amusement.

Percy notices their eyes too and decides he doesn't like it one bit, he pulls Newt onto his lap for all to see. Newt's face grows so red that Piquery is afraid the poor boy will pass out. Percival is just a smug bastard and is enjoying showing off his new mate to the world.