Part four. Possibly less humorous than the others, methinks. Reviews are still very much appreciated…speaking of reviews, WithlovefromTorchwood (who reviewed anonymously): I think you'll have to fight Erik if you want one of those brownies!
xoxo
Raven and Hank
"Hank, what's this?"
"Oh, that's caesium. It's kept under oil to stop it reacting with the air. It's quite a fascinating metal, really. It's in Group One on the Periodic Table."
"Oh, right. They're alkali metals, aren't they?"
"How do you know that?"
"Charles used to have this massive poster of the Periodic Table in our flat in Oxford."
"Oh. Oh, I see. Right. That makes sense."
"Is something wrong, Hank?"
"No! No, nothing."
"I know you, Hank. What's the matter?"
"It's just…well, I…Raven, what's the deal with you and Charles? Are you, like, uh…?"
"Oh dear God, no! Oh, that would be awful. He's just my brother, and that's all he's ever been."
"Oh, right. Sorry."
"Don't be. It's fine."
"I really am –"
"No, honestly, Hank. It's absolutely fine."
"Okay…"
"So, if that's caesium, is this one francium?"
"Well, I wouldn't advise touching it to find out. No seriously –"
"– That was a close call, wasn't it?"
"Would you mind terribly if I just showed you some books next time?"