As he speaks, as he tells Louis this thing, Louis sees it laid out so clear. A way to hurt Lestat, a way to dig a wound into him and punish him for the miracle of Louis' survival.

How cruel it would be to ask him, Only me, and not her?

Louis struggles with the impulse. Puts it aside eventually, smoking down his cigarette in silence while he feels out the ragged edges of the damage in him. Drained of hunger and anger, Louis is better able to parse the far reaches of his grief.

Looks at Lestat, seeking that same pain in him. A nod, acknowledging the answer. It is no grand declaration. If it comes as a surprise, or as a confirmation, it is difficult to tell from the way Louis looks at him.

"What now?"

Relieves Louis of the burden of asking him to stay. Of making that decision himself.