Just an addition to the information in
this post that may not be widely known.
Normally, the Imp patrols around the Submission strongholds carry a futa transformation potion (in the second Imp's inventory). If the MC becomes a Slime - AFAIK, this needs to happen
before encountering any patrols - then the potion will instead be an unsliming potion.
Since I normally use Imp patrols around Meraxis' stronghold to max the MC's level out anyway, and since I use ensliming/unsliming to customise the MC too, I normally:
1. Get the OLD Perk and a weapon that isn't based on unarmed strikes.
2. Go to Submission.
3. Get enslimed.
4. Start fighting Imp patrols (while enjoying the Physical shielding granted by being a Slime).
5. Only bother looting the second Imp's inventory/money and the first Imp's weapon/jewelry/inventory/money.
6. Unslime.
The items you loot are similar enough so they mostly stack; your inventory won't get too cluttered and it's relatively quick to sell them. The money gained by selling them, along with the cash the Imps carry, will take care of any expenses involved in setting up a milking operation. Somewhere in between steps #3 and #6, I make any physical alterations to the MC that I want to have going forward. And, of course, you'll have a bunch of unsliming potions to use to customise your house slaves.
Also works from a story perspective. A hellish (see what I did there?) couple of days spent farming XP by fucking and/or getting fucked in the tunnels of Submission can go a long way to explaining the abrupt descent into complete depravity displayed by the MC (well, my MC anyway).