Well, that certainly is a new interpretation of the scene.
I still think if you are right, the close relationship between Cissy and Sev did not start in their childhood but at some point post-school. Maybe got intensified during the inter-bellum years, while Bella was off in Azkaban, thus unaware of it.
And yes to the ambiguity. Severus already had the conversation with Albus. I wonder how soon after the DOM battle was Draco assigned his task.
I still think if you are right, the close relationship between Cissy and Sev did not start in their childhood but at some point post-school. Maybe got intensified during the inter-bellum years, while Bella was off in Azkaban, thus unaware of it.
And yes to the ambiguity. Severus already had the conversation with Albus. I wonder how soon after the DOM battle was Draco assigned his task.