When you bring a romantic partner home, that partner will immediately scrutinize your relationship with your step-sister.
It is important to have a thick skin and a prepared response. For most people living this reality, the relationship is purely platonic and familial. You shouldn't let outside perceptions dictate your living arrangement, but you should be prepared to shut down inappropriate commentary firmly. The more normalized you treat the situation, the faster others will follow suit. Moving in with My Step-sister
Do not force a sibling bond that isn't there. Do not ignore your attraction or repulsion; acknowledge it and manage it like an adult. Do not use the parents as weapons. When you bring a romantic partner home, that