To get a scene with Katerina, you need to support the orcs when you first meet her. To get the Cullen blowjob scene with the caretaker you need to play in the Arena and come with a certain level of lust to the caretaker.
The scene with the rabbit costume can be obtained in the bar in the center of the settlement, at the same location in the stable you can get the scene with the horse. To get the drunken sex scene, you have to lose in the Arena and lose in a battle with a demon to be slayed by an orc for you.
At the moment the game's development is on hold, I'm busy with another project now, once I finish it I'll probably continue working on Kallen isekai