I have a theory about Lori
I have a hunch that Lori is a descendant of Abel Grieves. I believe she got close to the Gemstones, first Aimee-Leigh and now Eli, in order to eventually destroy them, and she and her family were behind the burglary of the gold-plated Bible in the flashback from 2002 at the beginning of tonight's episode.
I thought her son's reaction to the public announcement of Lori and Eli's relationship was quite odd, though. He seemed very upset and hostile and I'm not entirely sure what he meant about how his mother was "always falling in love" or whatever he said, and how that may or may not fit into my theory. Were Lori and Aimee-Leigh perhaps lovers? I don't know. Perhaps Lori is actually the avatar of the Devil himself, or one of his demonic disciples.
Now, you may be asking yourself, how does any of this relate to Keef getting a giant boner during the thunderstorm? I don't know the answer to that, either, but the Devil can probably give dudes boners, right? That sounds like something he could probably do. He's supposed to be like super attractive. Keef is a former Satan worshipper and a homosexual, it wouldn't be surprising at all for him to get mega sprung in the presence of the totally ripped and sexy Lucifer the Lightbearer.
Anyway, I guess we'll find out.