It's her first time drawing the whole thing from the start!

It's completely different than just applying tones to nipples as an assistant

Akatama House, Dosuke-bei Dosukebe - pervert

Such a kind mister

Usushio, aren't you the lucky one having this mister as your first customer?

Mizuage (水揚げ) means having the first customer Literally "come out of the water". More specifically in the original context, it means the defloration of a young prostitute.

Nice to meet you...

Please be gentle...

Alright!

First things first

Let's decide on the character

The first time a pleasure woman (eromanga artist) has a meeting with a new customer is called a shokai Shokai (初会) - "first visit"