I feel like I've exhausted all the dialogue options when talking to Nyancy... I know that you say I just "have to approach her differently," but I'm grasping at straws here. Does anything need to happen first? Can anyone help me? Another hint would be nice.
When approaching Nyancy, you can get to have sex with her, but you can also befriend her instead, which gives you the catnip. Once you used the catnip, go back to Nyancy and you'll be able to see the alternative sex scene. It's the same as before, but has a different ending. You'll know you got it once you the third gallery slot for her unlocked.