"I- no, Bella," you say, shaking your head. "I know you're a strong girl, but you're going to plough as part of a team, like always." The mare's mouth drops open a little and she whines, still holding you against her massive body.
"But Master," she protests, holding you up with only one arm as she flexes the other in a display that results in one of her straps finally popping off of her body with a loud rip. "Look at how strong I am now, and how big! I know that I can plough all by myself, I just know it!" As Bella talks, her straps all strain with the sound of creaking, stretching lether, minute rips and tears appearing in most of them. The mare lets out a huffing breath, tongue peeking out of her mouth for a brief moment. "Pleease, Master?" Bella asks, eyes boring into you. "I'm stronger than any other mare you have - probably stronger than all of them put together!"
Held against Bella's muscular form and almost engulfed in brown fur, you sigh. "Bella, sweetie, can you put me down?" you ask - the mare does so immediately, and gently. "Walk with me," you say, taking one of her hands into your own - or rather, allowing her to engulf one of your hands with one of hers - and begin to walk away from the small crowd of ploughmares, Bella's monstrously strong form towering over you as you walk. Once you're far enough away from the crowd that you know none of them can hear you or Bella, you begin to talk.
"Bella, I know that you're big and strong, more so than any other mare on the farm," you begin, the mare beaming at your words. "But," you continue, Bella visibly deflating at the word. "I don't want you getting hurt. What if something went wrong while you're poughing? Not only would my strongest, biggest mare be out of action, but you could be seriously hurt!" It takes a lot of your strength to do so, but you lift up one of Bella's grey-furred, three-fingered hands, holding it up but unable to cover it. "I'm not letting that happen, Bella. I know you're very strong, sweetie, but if you got hurt, it'd be my fault." Gently kissing the fur of her hand, you're unprepared for the mare to snatch you up in a one-armed hug, licking and nuzzling all over your face.
"Oh, Master!" Bella squeals, the sound like quiet thunder. "You're so sweet... Okay, I'll plough as part of a team..."