[Regulus takes that in stride, surprised but also not at all. He doesn't shake his brother off, but he does step forward when they reach the door, and enters the house first. Kreacher is still here, at least he should be, and any defensive enchantments that still simmer around the door won't react to either of them, no matter what Kreacher mutters about Sirius.

The house seems to sigh when they walk into it, and Regulus smiles when he hears the whipcrack of Apparition and the house-elf appears an instant later and bows low.]

...ears have not deceived him, Kreacher sees Master Regulus returns and he brings his brother with him and Kreacher will make them both welcome though it pains him to see, nasty blood traitor that he is...

[Regulus knows he shouldn't laugh, but he has a hand out to hold Sirius back before crouching down and catching Kreacher's attention, staring at him for a few seconds to ensure he really has Kreacher's attention. It's more difficult when they grow so old, but this is Kreacher, Regulus is more than willing to be gentler with him.]

Don't speak about Master Sirius like that again, Kreacher. [And he stands again, because the discussion is over.] Fires, please, in the parlor and the bedrooms.