Lusting for your cousins, step-siblings, etc. is just so morally wrong on a whole different level. In the case of step-siblings, I will give some leverage if the two met before their parents fucked the entire scenario.
This is the series that tells you why family matters and what happens when you put an extremely independent and extroverted person in an opposite environment.
@Aniryu
"To go from being dependent on one man, and then immediately go for another instead of taking her time and becoming her own person. "
You do realize the time period of this setting, right? It's definitely not the 21st century.
Yup! It's depression. That "I don't know" when asked what's wrong is the answer. Now there's a way out of it. There's a PC way and then there's a non-PC way. Non-PC way is controversial but works for life whereas PC is not controversial and works for a period of time.