BRACE YOURSELF FOR A WALL OF TEXT©®

™

(I assume you mean more than just unconscious sleep, which yes, he did sleep with her, that’s canon)

 Y’know that’s smtg I’ve thought about, too. Was it only her body/age that was the obstacle there? She seemed to think so… or so it seems from what Louis shares with us re: just a few times when she even opened the subject with him. 

[VC Louis mon Amour by Segomichoco, via talamascaaa]

Particularly that time in Europe when they had just killed the Icky Gross Mindless Vampire, and they’re totally exhausted and hungry, and she offers him her wrist:

“ `Drink,’ she whispered, drawing nearer. `Drink.’ And she held the
soft, tender flesh of the wrist towards me. ‘No, I know what to do;
haven’t I done it in the past?’ I said to her.” <—- REJECTED. I don’t think Claudia shared blood w/ either Lestat or Louis, at least not in any intimate way, ever, which had to have been part of her not-growing-up frustration. 

SO BACK TO THE QUESTION AT HAND: 

No, I don’t think Louis would have slept with Claudia if she had been turned at 18+ bc there were more obstacles than just her physical form. 

• For one thing, Louis was in a relationship already with Lestat, even though it was a problematic one. 
• The chemistry between people (even IRL) has to work in that way for there to be any sexual attraction.
• He always cared for her like a daughter. She was very much his own security blanket, a buffer and a glue between him and Lestat. 
• She was less human than either of them, which did not seem to be something that made her more attractive, but less comprehensible to him: ” `I love you now with my human nature, if ever had it,’ I said to her.
  “ `Ah yes …’ she answered, still musing. `Yes, and that’s your flaw,
  and why your face was miserable when I said as humans say, ” I hate
  you, “ and why you look at me as you do now. Human nature. I have
  no human nature.’ ”
• Also, in terms of canon vampire physiology, the Ricean vampires seem to be asexual, blood gives them all the satisfaction they need/want in that regard. It’s in fanon and RP that they’re sexual.

As a side note, claudiaindarkness might have some good opinions on this, bc she often RPs Claudia aged up. thevampire-claudia also had a thread in which Claudia was aged up and *ahem* had some private time with a Louis (merciful-death) if u need some tasteful au smut ;]