Under Decepticon law, a leader must take one of the people who lived within a recently conquered territory to be a companion- regardless if said companionship was friendly or romantic in nature. Megatron was not an exception to this rule. One bot in particular had caught his optic as they had personally thwarted his previous unsuccessful attempts at taking over the cluster of cities.
It had taken several rounds of electro staffs and harsh physical blows to subdue the Cybertronian enough to drag them into his tent.
“My my~, what a suspicious little processor you have. That is good. You’ll need it to survive here amongst my ranks.” The silver armored warlord chuckled with amusement as his cuffed ‘prize’ glared at him. “So stubborn and fiery with that prickly nature of yours my pet. We are quite alike.”