I know that the line “you can be on top” is often taken as a joke, but not long ago I started thinking that Lestat hides all the important things behind humor or anger. And that’s how I came up with a theory that this was their first wedding night, and that it may have been the first time since Magnus that Lestat, of his own free will, chose to be a bottom. No one forced him or pressured him he simply offered it to Louis himself. I don’t know but to me it feels incredibly romantic and painfully sad.
Honestly, I think the people who take it only as a joke are approaching it with a specific motivation and/or a preconceived notion, because if it was Louis who said it, you know it'd be seen as inarguably canon.
Putting that aside though, I do think Lestat hides a lot behind humour (although I don't know if I think he hides behind anger? Anger's often an emotion people default to because it's usually easier to feel than pain, panic, humiliation or shame, and I tend to think that's why Lestat goes there so often, rather than him actively hiding in it), but I don't read that line as a joke at all, really? I think it was a little flippant, sure, but I think it was actually specifically about trying to put Louis at ease after his turning and burning (rhyme not intended, haha), and a furthering of Lestat's belief that turning Louis would empower him beyond the constraints of his mortality and give him what he actually wanted.
Having Louis top on their wedding night after he'd revealed his own monstrosity and turned Louis was about, at least in my reading, delivering on what he knew Louis wanted, but also in handing over a perceived sexual power in order for Louis to give into desire and feel in control of the night in a way he didn't the night with Miss Lily.
In that sense, I actually see it as Lestat continuing this conversation from 1.01 (below a cut because it's long):













