Once the story line with Agnes, Paula, Rebeca and Richard finishes (0.3.final in hopefully some weeks from now). The story line Olivia, Paula, Rebeca and Irwin will start (0.4). That will include some "bondage" like scenarios since that is what the Irwin character represents, rage, lack of control and wild instincts.
Sparky is definitely appearing. But its owner is a bit of a weirdo, so the role of Sparky in all this is still a bit fuzzy.