Lestat came across Oscar Wilde a couple of times towards the end of the 19th century, forced some therapy sessions on him, thus inspiring The Picture of Dorian Gray.
Dorian Gray is what Oscar Wilde pieced together from his impression of Lestat and his wild rantings about Armand. I don't remember the exact timeline in tvc but I know it was towards latter half of the 19th century that the whole Theatre de vampire/Claudia burning thing happened, and then he had to recover for a little while before going to ground back in New Orleans towards the beginning of the 20th century? Wikipedia tells me that Dorian Grey was published around 1891, so what I reckon happened:
Lestat comes across Oscar Wilde in Paris or London just after Claudia dying in Paris, looking a little worse for wear. Oscar is grossed out but a little fascinated, because Lestat can't help being charismatic, but they don't really chat that much, aside from some mopeyness from Lestat.
A few years later, just before he goes back to New Orleans (maybe he's come over from Paris, waiting to catch a ship across the Atlantic), he catches Oscar, who's surprised by how much Lestat's recovered, showing a little glimpse of his former glory. Lestat, finding an audience, unburdens about Armand, but still keeps specific details about vampire stuff back (it's before Louis talked to Daniel in Interview with the Vampire, so he's at least *trying* to be discrete, as much as Lestat can be). He mentions Marius a bit too, y'know, he paints the pretty young boy, some classical references, etc. Maybe it's muddled in his ranting about Nicholas, but he can't bring himself to talk for extended bits about Louis.
He doesn't tell him about how Armand looks, just that he's just as pretty as he is at his best (taking time to impress to Oscar that he really really is magnificent usually), but a little younger looking, even though he is older than himself.
Oscar needs to sit down to process this experience has to just piece together the wild ranting from this crazy french guy, and voila, The Picture of Dorian Gray.
Hi my name is Ebony Dark’ness Dementia Raven Morning Star and I have lustrous ebony black hair (that’s how I chose my name, considering my creator didn't give me one) with white streaks that reaches my mid-back and watery yellow eyes like limpid tears and a lot of people tell me I look like Adam, the first human in existence (AN: if u don’t know who he is get da hell out of here!). I’m not related to Milton but I wish I was because he’s a major fucking hottie. I’m a reanimated corpse but my teeth are straight and white. I have pale yellow skin barely covering the workings of my muscles and arteries. I’m a miserable wretch(in case you couldn’t tell) and I wear mostly black. I love Hot Topic and I buy all my clothes from there. For example today I was wearing a black corset with matching lace around it and a black leather coat, animal skins and black combat boots. I was wearing white foundation, black eyeliner and red eye shadow. I don't need lipstick because my lips are naturally black. I was walking outside in the Arctic. It was snowing and raining so there was no sun, which I was very happy about. Victor Frankenstein stared at me. I put up my middle finger at him.
I’ve been reading Frankenstein and during my meme search I’ve found people annotating the book for its poetic bits. I, on the other hand, would be annotating every time either Robert Walton or Victor says something really gay about Victor or Henry Clerval, respectively. That or how many times they say countenance (spoiler: it’s a lot)