I think if you go into it knowing they’re siblings, it’s all fine and normal. The rest of us saw the commercial blind, naturally interpreted the relationship as romantic and then were surprised to learn they’re siblings and the recalibration was funny. If you have no context, and you’re trying to interpret what the relationship is, at the beginning it definitely resembles a romantic relationship more than a sibling friendship
The rest of us saw the commercial blind, naturally interpreted the relationship as romantic
But… the first single word the actress said was “SISTER!” while pointing at herself…