It is now the second day of Fritz with his Dusky Slime on a quest. They had begun completing missions at the start of the day after he ate breakfast. He learned from the slime that all abilities and skills of the consumed being would become hers. But before we jump into the action, let's go back to what happened that night after killing kappas.
"I need you under me, bitchy slime. Can't have you stabbing me in the back."
The Dusky Slime might not look like it, but in its past life, it's a loyal and trustworthy servant. She proved herself deserving of her master's trust.
'How many times do I have to tell you, shitty brat?! I am not someone who easily discards someone for the sake of my own life!'
Again, Fritz and the slime were at it ever since they arrived back home. It was an assurance on Fritz's side not to let the slime backstab him. She has the potential to turn into a powerful being if properly handled.