Shrunk by Fire Emblem Girls!

         You didn't know how well Anna trusted you being in her pocket full of cash, but then where else could you go? It didn't look like Anna had any other places she could put you, but then the perverted side of you began looking toward her other valuable "assets". A part of you wondered if Anna actually wore anything underneath those clothes of hers, and without thinking you blurted out the question. Anna's raised eyebrow—verging on unamused by your question—was more than enough to make you a flustered mess spamming apologies to the point of begging for mercy. The next thing you heard was a sinister chuckle as Anna's eyes were narrowed dangerously. It was at this moment you knew: you fucked up.
         "So, you think you want to stay in my ladywear for the day huh?" Anna asked you. "Well, how about I cut you a deal hm? I'll let you take a joyride in my underwear—whichever one you pick—and in return you'll have to help me with my new shrink tonic. A fair trade no?" Anna's tone very much meant that you would become her eternal bitch of you went through with it, but then again she's the one that shrunk you without your knowledge or consent in the first place, so if Anna was offended by you asking to take a ride in her undies then that was to be expected. So you made your intention clear and reminded her of the predicament you were in, telling her that you'll help her with her tonic on the promise that she also changed you back soon enough; you never asked to be a test subject of hers and who knew what else she had in store for you, so you established some ground rules between you two and waited for her response. She paused for a moment, deep in thought, and finally opened her mouth to answer.
         "I suppose you do have a point or two," she said. "Yes, I waited until the right time to use my new tonic on you to see if it would work, and it did! But you know, even if I don't have your cooperation, I could just find another more willing test subject and leave you like this, and there'd be nothing you could really do about it." The cold reality of Anna's words hit you like a Bolganone spell; you ultimately had no real power over her making any sort of demands, and if she wanted you she would just leave you to your fate or worse. Ultimately the best option was for you to simply do as she said in the hopes that she'd at least be decent enough when handling you. Your mind made up, you told her you would work for her if only to eventually get back to normal.
         "Really? You'd do anything and everything I ask of you?" Anna asked. "Remember, I'm the one that has the final say-so on what we do together given how small you are, and that means I have complete leverage over you. You realize this right?" You nodded your head, the increasing feeling of powerlessness getting to you and conceding with the merchant woman. "Alright then, it looks like we have ourselves a deal then. You scratch my back, I scratch yours; simple." Before you could ask Anna again where she would end up putting you since it seemed like her underwear was now out of the question, she suddenly started to disrobe before you, showing off her lacy red and expensive underwear. "Since you're going so far as to effectively be my slave, I suppose I can grant you a request or two every now and again. You've got some guts to ask that of a lady I'll give you that, and you are right about me pretty much forcing you into this, so it wouldn't do if I was an all take and no give sort of partner. Now, I've got two choices for you: you can pick between my bra or my panties, and once you make a decision you can't go back on it for the rest of the day you hear?" Understanding full well where you stood, you nodded your head. "Good. So, which one are you going to choose hm?" Once again your dick was telling you to go straight for her panties, wanting to get all the closer to her precious woman hood, but you didn't want to push it too much given how you couldn't change your mind later. So with that in mind, you decided to…