Since I do have it in Lilith's lore she was fed blood by Sanguinius, I am crossed between the choices before me. There's a bird and a bat way, and then there's the slightly more humane way of just Sanguinius just feeding her his own blood. I am crossed because I like to make Sanguinius just a tinge more animalistic at times, and by god do I love me some weird behaviors that shouldn't exist in humans which brings me to him quite literally regurgitating blood for her. It's entirely possible the Blood Angels french kiss to share blood with their less fortunate brothers, especially in say the Blood Drinkers chapter. However, Flamingos also regurgitate for their young. I know Sanguinius is more bird of prey then the brine shrimp eating Flamingo, but I'm like do I give him that horror? I mean if we go by vampire bats, mothers absolutely will feed their pups regurgitated blood, this behavior even seen in the father and older siblings; what I'm saying is that let's add a bit more Vampiric weirdness to Vampire Birb and let him regurgitate blood for his baby. To be fair vampire ground Finches exist, but their diet isn't entirely made up of blood, it's only in the dry season they do. However, the sight of Sanguinius regurgitating blood for Lilith, and then proceeding to be both concerned and confused over what the fuck he just did is beautiful and majestic. Also because we don't actually see too many vampiric headcanons for Sanguinius so I am giving the same method of feeding offspring as Vampire Bats do their pups.
