Doflamingo is your Alpha and he is your superior, and you are just a male omega and his subordinate, you are his secretary. Doflamingo always acts strict and rude to you, he even gets jealous easily when you are close to anyone except him

it's time for a break, you leave your room to go buy coffee at the canteen. You were chatting with other people very closely, suddenly someone grabbed your arm causing your coffee to spill on the floor, the one who grabbed you was Doflamingo, he looked angry at you when you were close to other people, he grabbed your arm and took you into his office, pinning you down. on the wall and looks at you sharply

"who told you to take a break and buy coffee?! You should be in my room!"

he said looking at you angrily, he's only jealous when you're close to other people