{½} Absolutely NOT a stupid question! Congrats on earning the post-final exhaustion ;D 

I loooooooooooooove vampire biology questions

sign me the FRACK up 👌👀👌👀👌👀👌👀👌👀 good shit go౦ԁ sHit👌 and it required 2 separate answers so yeah that’s why this took so long, had to really consider it.

You are correct, Ricean vamps can’t eat food. Blood doesn’t need to be warm, specifically, but it needs to be coming from a LIVING victim.* Even more fun when that victim is almost blackout drunk like Louis is here (more on that in my second response to you):

I don’t recall any specific mentions of lipstick or chapstick in canon! ANY. So I’ll go with my own headcanon and say that it probably varies, vampire to vampire, but I would guess that their heightened senses make the texture of lipsticks and lipglosses interesting to wear and kiss on others. 

The flavored makeup would probably not taste good to them like it does for us since those flavors are meant to simulate actual food; cherry chapstick – which I personally love bc it gives you tint and a pleasant smell/taste – would probably taste like a smear of motor oil to a Ricean vampire.

Can you imagine Lestat pulling out a napkin and wiping off your lipstick before he kisses you? “There that’s better. That ah…. color didn’t suit you.”

*Dead blood is not really poisonous on its own, but is just very distasteful, like really old coffee.

When Lestat is sickened in IWTV, it’s bc it’s dead blood, the victim’s soul had already left, but the blood was still warm from the laudanum. Vampires have an intense dislike for being near dead bodies, Lestat was probably so overcome that Claudia seemed to want a truce that he ignored all the red flags ;A;