Crying.
Applejack was a pony of unwavering morality. "Son, you be hard working stallion" his poppa always told him. Momma said to "find a good mare and always make her happy". He hadn't really been able to do the second part but he was true to his word and always said that one day he would... just not today, or the next day. It seemed there was always something that needed to be done besides courting. Even when invited to the Grand Galloping Gala, surrounded with beautiful mares, he was still trying to work.
Work he snorted to himself. Never in his life had anything gone so horribly wrong as the Grand Galloping Gala! A small noise broke Applejack out of his storming. He realized he had somehow wondered into the garden while thinking, looking around himself for the noise. He couldn't tell what it was a familiar sound, so soft it was barely audible and it brought a tightness to his chest. After a moment of searching he found where it was coming from and, like a knife through his heart, he realized what it was.
Many nights he had heard that sound after his parents died. The family was strong and kept going day in and day out, but in the dark everything came pouring out. The soft sounds of sobs from Red Gala's room could be heard from Applejack's room next door. It broke his heart to think of his big sister, the glue that kept them all together, crying herself to sleep. There sitting right before Applejack Elusive was sobbing uncontrollably and almost inaudibly.
Applejack stood for a moment unsure of what to do. He knew that while the White Unicorn may have been more in touch with his feminine side that didn't mean he wanted to be caught crying. Elusive was very socially aware and while nopony actually knew it Applejack was too. For a stallion to cry in public would be humiliating and shameful to say the least.
So Applejack just sat there. He waited until the sobs had subsided, each one another buck in the chest. Finally, when he was sure Elusive was ready, he backtracked from his hiding spot and loudly reentered. "Why, Howdy Elusive! I tell ya' these ponies have no sense of taste! Only one pony bought my pie's and, between you and me, she seemed funnier than a carrot on an apple tree"
"Why Ap-Applejack," Elusive said trying to regain his composure "I would love to buy one of your pies! And maybe some ice cream?"
"Momma, he aint no mare but i promise: I'm always gonna make Elusive happy" Applejack said silently to the night sky.
Next prompt: Sister.