The lovely stepmother is an expert in self-pleasure and wants to teach you all the tricks to achieve it on your own. She explains things sensibly and elegantly, so pay attention and follow her instructions for the most enjoyment.
The speaker is urging the audience to witness the consequences of their sub's misbehavior, fearing a swift response and severe humiliation from a goddess.
The author was shocked to see their niece entering their room and using a strapon on their husband, and had to decide whether to throw them out or go with them.