Applejack wasn't sure why, exactly-besides that he always managed to make her feel really good, his reaction was making her feel so... warm. Why the delicate throb beneath her fingers made them tingle. Why she wanted to do this for him, besides the obvious need for it in his voice. It was all just happening. Just part of.
She found she wanted to give him all that he longed for. So per his instructions, and with the visual of Pinkie Pie and a lollipop firmly in her mind, she trailed her tongue from the top of her index finger to the tip of his arousal. The first lick was slow. So she could get a taste for him. The second was a little quicker yet payed more attention to the tip. "Like that?" She whispered softly, her lips only resting against the swollen head.