(Splitting this up to increase options.)
"Therein lies our main problem," Ladybug sighed. "The easiest way would be to dominate the herd, but..."
She trailed off, unwilling to continue.
"We need a stallion," Leksea finished for her. Giving her mother a pointed look, she snorted, "Is that not what you were thinking?"
"Well, yes, but-"
"Use me." Leksea saw her mother flinch. Stomping her little hoof in frustration, she argued, "You cannot become a stallion yourself without transferring or accelerating your pregnancy. And I can tell you do not wish that. I, on the other hand, have no such obstacle. Really, this solution is obvious."
Ladybug turned to her in dismay. "B-But...my darling. My little Leksea..."
Seeing her mother in such distress, Leksea felt a pang of guilt and softened her tone. "Mother, I know this is difficult for you, but I was never meant to be this in the first place. Once we reach our goal, we will be human again anyway and better able to handle our instincts. Please, do this for me."
After a few seconds of silence, the mare shuddered. "Very well, my darling. I will do it. Just hold still for mommy, alright?"
Knowing her mother was readying the spell to turn her into a stallion, Leksea braced herself.