It's not that Bolin hated Eska, frankly it was impossible for Bolin to hate anyone! She just terrified him.
And when he saw her coming after Varrick's boat he felt as though someone had given him an electric shock! Her eye makeup was smeared, and she had this rather manic look on her face that would scare even toughest of men! (It scared Mako, and in Bolin's mind he was the toughest)
Varrick (the awesome) had made a great attempt at escaping from Eska but his boat had a malfunction only a minute after the thing had hit full speed! And soon, she had caught up with them and was on the vessel.
Eska breathed hard, a deadly glint in her eyes. She looked as though she had been crying, though it might just have been sea water getting into her eyes causing the redness. Everyone stayed back, until Bolin was given a shove by his brother, "Get rid of her," he said in a sharp whisper. "Are you kidding? I can't you know that," Bolin attempted to save himself only to have Korra grab his coat collar, "Take care of it! We can't have her with us!" she said loudly, not caring if her creepy cousin could hear her.

Bolin cleared his throat, "Uh hi, Eska," he said in a calm tone, his gaze not meeting hers.
The young EarthBender was given the great pleasure of having his friends make excuses and walk away, even Varrick told him he was on his own. Perhaps he had been through too many break ups to want to see another one.
"Bolin!" Eska said, her dull tone still clear even as she yelled at him, "Why have you retreated?! You are to come back with me and become my husband!" she grabbed his sleeve and began to tug him towards the edge of the boat. Bolin was panicking; in one swift movement he pulled his arm away from her grip. The WaterBender girl hissed.
"Listen um, Eska," Bolin said clearing his throat, "The thing is, I don't want to get married…Yet!" he flinched as she adjusted her sleeve, "Nonsense," she said coolly, "You are just suffering from cold feet my weak minded Otter Penguin," she said, the tiniest hint of fondness in her tone. Though you really had to strain to hear it.
Bolin gulped, realizing that she had calmed down considerably he forged forwards with a bit more confidence, "No, no I'm not having cold feet," he said, and flinched as Eska's eyes widened a small fraction then narrowed. She didn't say anything, so Bolin took that as her wanting him to continue, "It's just…Uh, it was thrown on me so… I don't love you!" he bit his bottom lip, that hadn't been what he had intended to say exactly. It just came out!
He could see Eska's face turn from dull to angry in half a second, "Then you have lied to me?!"
That was her logic in a nutshell, but perhaps she was right? Bolin tugged at the bottom of his coat, looking at anything but Eska, "Not exactly, it's just everything went erm… A little too fast for me!" he said, feeling somehow bad for what he had said.
"Perhaps if we could take it a bit slower," he offered, it took all his will not to choke on his words, "Maybe you'd like to stay on the boat with us? Just for a short while?" he continued, after a few seconds it dawned on him what he had just done! Eska clenched her teeth, looking very snake like.
"My dear brother and father preside in the southern water tribe."
Bolin was almost hopeful then that she would turn around and leave! But no such luck was had, "I shall stay for two moons so that we may grow more acquainted," she said blandly, "Then I shall take you back with me so that we may be married."
"Yeah great!" Bolin said chukling nervously, "I'll uh, show you to your room!" he gave an enormous false smile.

"What is she still doing here?" Mako questioned his younger brother. Eska was sitting on Bolin's bed staring blankly at the wall.
The young EarthBender shrugged, "I tried!"

I may or may not continue this, depending if people actually read it and want more X)
I feel like Eska was just another reason for us to laugh at Bolin (who needs more to him I believe) and I thought that maybe she could be given some actual character.
I apologize if anyone is out of character! This is my first attempt at writing these characters.

And, I will not be following the story that is coming in future episodes. This will be like an alternate world or something ;)

Please review! 8D