"Because that's how I was raised and the wisdom that was imparted to me by my parents."

Mostly his mother, but the point still stands. But listening was also a key part of that, and so Alucard does his very best to shut up and listen.

It makes sense that D's not used to this whole someone-giving-a-shit thing. His circumstances are so dramatically different that for it to be otherwise would be the truly strange element at hand. But it doesn't make it easier, because Alucard can't simply rely on phrases like common politeness or social contracts to get D to maybe be a little more open.

He lets out a soft, considering noise.

"In the future, can you let me know when you head out?"