Easy. It wouldn't be that difficult, but it would be perplexingly specific:
(1). "I get to meet your insane boss. And I mean I want to meet him as in I want him to enter my head. No questions asked; Give me at least 20 minutes. He'll work out instantly why I'm asking for this as soon as he makes contact with my memories, and he will mock the ever-loving crap out of me. But it will be utterly worth it to me. And he'd also realize that I'd have the potential to be more loyal to the Empire than any Yeerk he dropped in me."
(2). "Whoever enters me leaves me and my daydreaming business the **** alone, and in exchange if the Yeerk ignores the background stuff the Yeerk practically will not know I even exist."
(3). "The Yeerk is a competent actor and only starts doing things I wouldn't do if we end up too involved in the business of the invasion. Because if the Yeerk screws this one up, the smarter love interests I have will catch on that this isn't me eventually. And trust me, you
don't want to explain that to a sociopathic knife expert and a Green Beret in my wimpy little girl body."
(4). "If I have a certain defect, I want it cured. I'd eventually become pretty useless if I had it anyway."
That's pretty much the gist.