"I still don't get it," Claire whines an hour or so later, still attempting to learn the same thing.

"What part don't you get?" Castiel asks, starting to get fed up with this. What's so hard about this? It's just plain logic.

"All of it."

Castiel sighs. "Fine. Okay, so this angle and —" He's cut off by his phone ringing. "Hold on." He pulls out his cellphone to see that Dean's calling him. Well, he can't ignore Dean, so he answers the call.

"What, your friends are more important than my education?" Claire asks teasingly.

"You don't want to learn anyway. What do you care?" Castiel retorts with a grin before saying into the phone, "Hey, it's Castiel." He should really think of a new response when answering his phone because this one is getting boring.

"Hey, Cas," Dean replies, sounding amused. "You tutoring or something?"

"Yeah, kinda."

"I heard you kidnapped someone," Dean tells him.

Castiel sighs. "So says the media. No, I just sorta picked her up off the streets and she's crashing at my family's place now."

Dean chuckles. "Because that's normal. Anyway, I'm bored, and I was hoping you were bored and could make me not bored, but it doesn't seem like you're bored so I'll just continue to be bored."

Castiel can't help but grin at how he phrased that. "I've been going over angles for the last hour. Trust me, I'm bored."

"Then do you want to come over?" Dean asks.

Castiel is about to agree, but he pauses. He probably shouldn't leave Claire here. If nothing else, she has homework to do. Maybe he should just stay here with her.

"Sorry. I've got math to do," Castiel tells him apologetically.

"If you've really been doing that for an hour, I bet... whoever's homework you're helping with... their brain is probably fried. Take a break."

"I don't know..." Castiel says hesitantly. "I kinda want to at least teach Claire angles."

"'Claire'?" Dean echoes. "The girl you kidnapped? You could bring her and whatever siblings you feel like bringing and we can have a mini party, and I can meet the girl you kidnapped!"

Castiel rolls his eyes. "I didn't kidnap her, but I'll ask." He lowers the phone and covers the microphone to ask Claire, "Want to come with me and probably Gabriel and whoever else comes — so probably Lucifer, at least, too — to see my boyfriend?"

Claire shrugs. "Yeah, sure. Anything to get me out of math."

"Then I guess we'll see you in a few," Castiel tells his boyfriend with a smile before hanging up. "Who wants to go to the Winchesters'?" he calls loudly.

"Me!" Lucifer yells back immediately.

There's some quiet shuffling upstairs, and Castiel can faintly hear him urging Michael to come as well. A minute or so, both Lucifer and Samandriel come down to join them, but no Michael. Castiel doesn't ask, because he knows Lucifer will tell them anyway.

"Michael's being mean and ignoring me," Lucifer pouts.

"He's studying," Samandriel clarifies.

"Shouldn't he be out of college by now?" Claire asks.

"Med school," Samandriel explains. "Another four years of not having a social life for him."

"Michael never had a social life," Gabriel reminds him, joining them in the kitchen.

"He doesn't need one," Lucifer replies. "He has me!"

"I'm so sorry for him," Claire jokes, earning a fake glare from the boy.

"Are we taking a family trip to the Winchesters' or not?" Gabriel asks. "Cuz if not, I'm just gonna go without you guys."

"No, we're going," Castiel assures him. "You know, if we can find a compromise for seating."
Almost as if the word "seating" is a trigger word, everyone yells simultaneously, "Shotgun!"

~~

Castiel drives Lucifer and Claire to the Winchesters, and Gabriel drives Samandriel. It's possible that Castiel may have forgotten how to get there and had to follow Gabriel, but in his defense, he hasn't been to Bobby's junkyard in over four years.

"Sam Sam Sam Sam Sam Sam Sam!" Gabriel repeats over and over as soon as he sees the boy, running towards his boyfriend. Sam just laughs and gives him a hug and quick kiss on the forehead.

Dean appears a moment later. He and Castiel share a quick hug before pulling apart like civilized people and not lovesick puppies. Lucifer walks up to them and pushes Castiel into Dean's arms before backing away as if he didn't do anything. Dean rolls his eyes and stands Castiel up next to him. Lucifer death stares him for not being all coupley, but neither member of Destiel really cares.

"Claire?" Sam says in confusion, just now noticing her.

"Hey, Sam," Claire replies with a small head nod in his direction.

"You know her?" Dean says in mild surprise.

"I know of her," Sam replies. "What are you doing with the Novaks? I didn't take you and Anna as the friendly type."

"Oh, we're not," Claire tells him. "She hates my guts."

"Cas kidnapped her," Dean fills in.

Castiel slaps him on the shoulder before clarifying, "I picked her up and now the world thinks I'm a rapist. I'm sure it'll blow over soon. Claire already made sure the world knew she came because she wanted to."

"Hey, Sam," Lucifer interrupts the conversation suddenly. "What do you know about Cain?"

"Cain who?"

"Cain... I don't know his last name," Lucifer admits. "Cain..."

"Anna's boyfriend?" Sam guesses.

"You knew they were dating?" Lucifer demands.

"Yeah, everyone does," Sam tells him. "'Least, I thought so. Did she not tell you?"

"Nope," Gabriel replies.

"Claire told us today," Castiel informs him.

"How did you guy not know?" Sam asks. "I mean, they got together my last year there, so it's been, like, two and a half years."

"Okay, but, like, what's he like?" Lucifer prompts.

"I don't know," Sam replies. "I never really liked him, but I don't know him well enough to really judge him."

"He's lying," Dean announces. "He used to complain about him all the time."

Sam smacks him on the shoulder, hard. "Dude!" he hisses.

"What? If it's Anna's boyfriend, I think they deserve to know."

"Have you met Lucifer? Cain won't last another day," Sam says as if Lucifer isn't standing right there.

"What, he'll bore Cain to death with Bee Movie?" Dean suggests, rolling his eyes. "Yeah, really scary."

"I've got more than Bee Movie now," Lucifer replies with an evil smirk. "Ooh, wait, hold on!" He pulls out his phone and does something that no one else can see. After a moment, they can hear the ringing that shows Lucifer called someone on speaker. It rings... And rings... And rings... And rings... And it keeps ringing...

"This is Michael. Either I'm not near my phone, or you're Lucifer calling for something stupid, and I don't want to hear it. Unless you're Lucifer, leave a message. Beep."

"Michael, pick up the phone!" Lucifer whines. "Michael! Oh my god, Michael, pick up the damn phone!"

Lucifer hangs up and tries again, once again going straight to voicemail.

"Mikey! Answer me!"

And redial.

"Michael, I know you're awake. Answer the phone."

And redial.

"Dammit, Michael, I'm counting on you."

And redial.

"Michael, come on!"

And redial.

"I'm just gonna keep calling you 'til you pick up."

And redial.

"Dammit, Lucifer, I'm trying to study!" Michael practically yells in exasperation on the other end of the phone. "What do you want?"

"Hey! Hey, hey, hey Michael!" Lucifer says with childish excitement. "Guess what?"

"What?" Michael asks, annoyed.

"There's antimony, arsenic, aluminum, selenium!"

Michael sighs. "And hydrogen and oxygen and nitrogen and rhenium."
Lucifer grins as they both sing together — if you can even call Michael's reluctant obliging 'singing' — "And nickel, neodymium, neptunium, germanium, and iron, americium, ruthenium, uranium. There's lead —"

"What?" Michael says in confusion.

"What what?" Lucifer asks. "You didn't know there was lead? That's actually a really common substance. I'm surprised you've never heard of it."

Michael sighs. "I know what lead is. I mean that's not next in the song."

"Uh, yeah, it is," Lucifer replies.

"No, that's later in the song," Michael tells him. "Now's europium, zirconium, lutecium, vanadium."

"No, it's lead, pric — okay, someone's gotta google this."

"I will," Dean volunteers, whipping out his phone.

"Oh, am I on speaker?" Michael asks. "Hi, whoever's there."

As Dean looks up who's right, everyone else says 'hi' to Michael. Finally, Dean says, "Tom... Leh-her, or something, right?"

"Yep," Michael and Lucifer both confirm.

Suddenly, Dean's phone begins playing some song. He cups the speaker so everyone can hear. "There's antimony, arsenic, aluminum, selenium, and hydrogen and oxygen and nitrogen and rhenium, and nickel neodymium, neptunium, germanium, and iron, americium, ruthenium, uranium. Europium, zirconium, lutecium, vanadium, and lanthanum and osmium and acitine and radium."

Dean turns off the music and looks at Lucifer with a smirk. "You dun goofed. After all these years, you finally messed up."

"But but but but but but..." Lucifer stammers.

"Sorry, Luce," Michael says. "The song doesn't lie. I was right. It's europium."

"But..."

"Dude, it's just a song," Gabriel reminds him, noticing his heartbroken expression.

"No, it's not just a song," Lucifer protests. "It's my thing. It's what I do. I just messed up reciting something. I don't — I never mess up reciting things. I can't believe..."

Gabriel walks over to his brother and pats his back reassuringly. "It's okay, Lucifer. It's just one song. You're still the reciting things expert."

Lucifer gives him a small smile. "Thanks."

Gabriel smiles back up at him. "No problem, Luci."

A/N I don't know how to spell acitine and I'm too lazy to google the lyrics for the song so I'm just gonna leave it.