So I've broken two people so far with what is a somewhat minor twist... I wonder how many people will break by the end of this
Lucifer isn't the biggest fan of Lucy, that's for sure. Ramiel calls him that though, so he's gotten used to it. It's really just a way to needle him, especially since he would much prefer a different nickname from Gabriel.
I think there's been a mistake. There's no way I produced.... this. Please say it isn't so. Please.
Any direct flirting with Lucifer is cut off directly, but shy flirting is mistaken by Lucifer just thinking that Gabriel wants to know him better in a non-romantic fashion, which leads to a lot of embarrassment on both of their parts later.
Incest really isn't a thing for angels. There's no genetic defects or any consequences of 'inbreeding,' and inbreeding in and of itself is nearly impossible, as since angels were created out of the aether of existence, they have no inter-relatedness. I will say Gabriel is the only archangel with angel parents, and there really haven't been any new angels in some time. Angels don't die off of natural causes, so when there isn't a war, there is no need to have new angels. All that being said, Lucifer has always viewed Gabriel as his child, and he desires that kind of affection and loyalty, not the romantic type. Lucifer really isn't into romance after his relationship with Gabriel's other parent. But it does serve him right as no one bothered to tell Gabriel of their parentage.
Lucifer lost Heaven and the trust and respect of almost every living creature, most Fallen included. While he has earned back some respect, what he really wants is to have something of his own that cannot be taken from him--a father-child relationship. Gabriel is, in a sense, the only thing he has which he can feel proud of and hold up as proof that he isn't all evil and sinful. He overreacts when Gabriel is in danger, in no small part because while he is proud, he has worked hard to conceal their relationship so that his taint does not effect Gabriel. And Lilith is particularly vicious, so he does have a bit of a panic attack when he finds out that she knows (she was mostly guessing) and he isn't sure what to do because Lilith hasn't made it common knowledge so she's saving it for some sort of leverage. He won't be able to protect the one thing most precious to him in all of creation, and that knowledge threatens him at his core.
And if Gabriel and him don't have a good relationship, he definitely has some regret about Gabriel being an adult because he does have fond memories of a young cherub and seraph Gabriel.
Yes, there is! Heaven and Hell are my opposite ends of the spectrum, but there's a solid earth/neutral path. It's probably my favorite path.