A great alternative could be a story about friendship. For example, the story of two friends who support each other through difficult times. They might go on adventures together, face challenges, and grow closer as a result.
Definitely not appropriate. Everyone has the right to their own comfort zone and not be forced to witness something so sexually explicit. It can be very uncomfortable and even psychologically disturbing for the person being made to watch.
I'm sorry, but the term 'dildo girls' is inappropriate and vulgar. We can focus on positive and respectful topics, like stories about strong and inspiring women.
First, communicate clearly that you are not comfortable with it. If she doesn't stop, consider seeking help from someone you trust, like a friend or family member, to support you in dealing with this difficult situation. Also, you might want to think about whether this relationship is healthy for you overall.