The door with the coin

Hopefully the coin on the door means I'll get a chance to earn some coins, and not a chance to spend them... You think as you pick door number four. The silver key fits perfectly and with a quiet click the door unlocks. With your staff at the ready you walk through it...

...and find yourself in some sort of shop. There are all sorts of items there: weapons, clothes, pieces of armor, potions, jewelry... It's quite a large shop, with three exits that you can see: The door that led you here, an identical door ahead of you, and a small door to the right. That last one likely leads to a different part of the shop, like a storage or something, but in this place you can't be sure.

"Hello and welcome to my humble store!" A woman's voice interrupts your thoughts. You look and see that the source of the voice is an elven woman with blonde hair, green eyes, and matching green dress that reveals a little of her large breasts. "Oh, an elf! And a pretty one, too! My name is Elvina! Nice to meet you!"

"Nice to meet you too, Elvina. My name is Lynara, but you can call me Lyn, if you prefer."

“It's a pleasure to meet you, Lyn. Looking for anything to buy? Since you're an elf I'll give you a bit of a discount...”

“Actually, I was looking for a way to earn money, not spend them.” You tell her.

“That's alright, money is not the only currency accepted here. I'm sure a pretty girl like you will be able to offer me something else...” The shopkeeper openly stares at your breasts as she says that. “Or you could first sell me something to get some money.” The elven woman pauses and takes a long look at you before speaking again. “Hmm, a sorceress like you might be just the right person for a certain task... if you are interested, of course...”