Carefully

You quickly talk about what would be needed, such as payment, expected work, cancelling the agreement, division of loot and about things not covered by the contract.

Emptying out the remaining three lootbags you got before; you found parchment and a basic charcoal pencil in one, and make this contract:

Belgar agrees to hire the whores Jane and Amy as Assists. He bares the responsibility of paying them the equivalent of one gold coin per day (can be paid in advance or latter if agreed with the Assists) Payment can include, but is not limited to coinage, precious materials, food and equipment. He also agrees to do his reasonable best to protect them.
In return the assists agree to perform any sexual act he requests of them, or any act he requests that supports their mutual well being. He privately and personally retains the rights to them.
When not needed by him, or when temporarily released by him, the assists are free to do as they desire, except for having sex in any form with any other male.
Any gains they receive while working in such a manner is theirs to keep.
The Assists and Belgar may cancel this agreement by notifying the other party)

They all signed it.

They went through the equipment and Belgar smiled. Amy was good with a bow and arrows, so she took them and some green clothing. Jane was good with her hands, and kitchen knives. She took the many knives the rogue player had, and his dark clothing to help her blend it. The fact it was studded leather and not designed for her breasts made it look good on her.

You took simple clothing, and a dark green cloak to camouflage yourself due to your lighter colored clothing, while having 2 daggers and a short sword equipped on your belt

You gave each of them another gold coin and placed the rest of your stuff back into your inventory