"Another failure Madame?" Came a voice from off to the side of Nyla. "In a ways... but maybe she is still salvageable yet. In terms of being able to defend this dungeon however, I have very little hope for her. But who knows, perhapse she has some latent talent tucked away deep within her cleavage or something?"
"Er, that is highly doubtful, Madame. From what I can sense, at her best, she is likely to be either just, or even below average in terms of combat potential. We really cannot spare any added expenses at the time for you to have a hobby like this."
Nyla turned to face her head servant, Ambrosia. She is also a succubus, but as she is not a matriarch like Nyla, she has a normal height and size. "Amber, who said she would be costly for us? I intend for her to pull her own weight around here. And since she willingly became my pet, I no longer am her employer, but instead, now I am her owner, meaning she doesn't need the normal compensation."
"Oh, will that really be ok though? Isn't that in breach of the contract?"
"You worry far too much Amber. I have already taken care of everything, see" said Nyla as she motioned for Amber to take a closer look. Nyla pointed a finger at you and began pouring her magic into you, etching her sigil onto your lower body painlessly. The sigil is a sign of her ownership of you and your submission to her. A near permanent contract that is almost impossible to annul without your death being a result.
The sigil does a few things. First, it marks you as claimed so others cannot take you. This is importaint for any creature in the dungeon to have as it prevents tamers from stealing them, and other's from recruiting them from underneath the dungeon Master.
It also makes you 100% obedient to Nyla, in every manner of speaking. If she says cum, your body will instantly will cum on the spot, even if you are not physically aroused in the slightest. If she says walk next to me, but only on your fingertips and without falling while blindfolded, you will do that and be able to follow right next to her the whole time. It is incredibly powerful magic.
Lastly, it allows for the master to reward and punish their subordinates with either pain or pleasure, and is even powerful enough to bypass any kind of counter magic that is used to try and nullify the effects. The downside to it is that it permanently links the subordinat's life to their masters. If the master dies, all the subordinates do as well. But not in the reverse.
The only surefire way to remove the sigil without any downside or after effects is to have the master do it willingly. And now you are marked with this sigil. You just didn't realize it yet as you were still asleep. Nyla smirks after having an idea and pours just a tad bit more magic into you, causing 6 more breasts to grow out in 2 columns beneath your first row. Each row shrinking down a full letter size from the row above. To make it work, she also increased your top row up to a large pair of D cups so that your bottom pair was an A cup. She adjusted your outfit to still fit you accordingly as well. Your uniform now had 4 rows of lumps that for the second row, had a cut out window to show off your underboob cleavage, while your top row bairly was holding onto the fabric. The strapless design was showing its straining limits on your upper most row, but not in a bad way. Magic would prevent it from falling off of you too, so this very provocative "about to fall off" situation was simply just an appearance. Your outfit would never budge unless you or Nyla meant for it to. She also raised your heels up 5 inches and added a platform to the bottom of your Mary Janes, turning them into heels. But she did this simply to accommodate the new shape of your ankles as she turned them into a more cat-like shape that forced you onto your toes full time. Your new foot structure also meant that wearing heels for an extended period of time is very comfortable, and there would be no negative impact on your health because of you doing it.
After the slight modifications were finished, Nyla dismissed Amber and returned back to petting you while you napped, still completely clueless as to what she just did to you.