Batman and Adventure Time Crossover FanFiction 2: Mothematical!

This is the sequel to my last fanfiction and is also the second story in my Batman and Adventure Time series. It takes place a month after my last story and will feature lots of giant bugs. It focuses on Finn and Marceline continuing their relationship such as Finn getting to know her soul-sucking father better and meeting up with his ex, Flame Princess again. Killer Moth is the villain of this story to give him a chance of being a badass main antagonist when most of the time he is treated like a joke. He attempts to do this by leading an army of giant monster moths from the Land of Ooo to take over Gotham. I absolutely do not own Batman which belongs to DC Comics and was created by Bob Kane and Bill Finger and Adventure Time which was created by Pendelton Ward. Batman is in his Arkham City look with Kevin Conroy reprising his role. Killer Moth is in his look based off of his character bio picture from Arkham Asylum since he didn't actually appear in the Arkham Games. Enjoy!

Mothematical!

Synopsis: Finn and Marceline's relationship has been the raging talk of Ooo and almost all the princesses that have been hot for him are extremely envious of the Vampire Queen. That includes Finn's former girlfriend Flame Princess who has mixed feelings about the whole thing. Hunson Abadeer seems to be totally cool with his daughter dating Ooo's hero even though he's the Lord of Evil. During the same time in Gotham, Killer Moth is tired of being treated like a joke villain and decides to step up his game. He does this by going to Ooo and finding a swarm of giant monster moths and making them do his bidding. He goes back to Gotham with his army to make the city his. With their worlds colliding again, Batman and Robin team up with Finn and Marceline again to stop Moth and his army.

Chapter 1: Dinner With Abadeer

The Nightosphere. A hellish-like dimension that is crawling with demons and other horrible creatures and the leader of them all is the one and only Hunson Abadeer, the Lord of Evil. He is also the father of Marceline the Vampire Queen who is currently having dinner with him along with her boyfriend Finn the Human. Finn had met Abadeer a couple times already, even though those involved stopping him from stealing everyone's souls and saving his girlfriend from his evil amulet. But despite all that, Abadeer really seemed to like Finn and approved of his daughter's relationship with him. Finn, Marcy, and Abadeer were in Abadeer's house at the dining room table eating together. Finn was having spaghetti, Marceline was sucking all kinds of red foods dry, and Abadeer was eating a giant sandwich like the one Finn knocked out of his hand that one time. They were silent for the most part while they were together mainly because Finn didn't know what exactly to talk about with his girlfriend's father. Finn made an effort to make conversation by saying, "Boy, it sure is hot out there isn't it?". "It's always hot in the Nightosphere. There's lava all over the place.", Hunson said. "Right. I just meant I'm not here at all so I don't really know that.", Finn shyly replied. "Finn, you don't have to try so hard. I think you're a fine kid just as you are.", he assured him. "Thank you, sir.", Finn said. Marceline chimed in by saying, "I see much hasn't changed since the last Time I was here.". "Nothing ever changes here. You should know that seeing as how you've spent centuries here.", he said to his daughter. "How's the food?", Hunson asked the both of them. "It's very delicious. Thank you, sir.", Finn said. "It's as good as it gets here.", Marcy said. "So, Finn. How's the life of the hero going for you?", Abadeer asked. "It's as good as it ever is. I just love doing what I do. It's what I was born to do.", Finn answered. "And it's kind of ironic that you believe in good and do great things, but yet here you are having dinner with the Lord of Evil.", he said. "That is quite ironic, but that's mainly because your daughter is the best person in the whole world and I love her very much.", Finn said as he looked at Marcy lovingly while holding her hand. Marcy smiled lovingly back at him as well. "You two haven't had sex, have you?", Abadeer asked out of nowhere. This caught them both off guard and caused them to blush as red as the red food she was eating. "Dad!", Marcy said in shock and embarrassment. "No, we haven't.", Finn just said flat out. "Well, that's good. Just wondering.", He said while sipping on his drink. Not too long after that awkward moment, Finn and Marceline finished their food and began to leave the table. "Well, thanks for having us, Dad. But we really should get going.", Marcy said. "Are you sure you guys don't want dessert?", Hunson asked. "No thanks. We're both full. Right, Finn?", Marcy said while looking at Finn. He clearly knew she just wanted to get out of there, so he agreed with her. "I'm sorry if I made the both of you uncomfortable before. I was kinda just joking around.", Abadeer said. Finn began to get a call on his phone and he answered it. "Hello?", he said. "Finn! We got some crazy junk going on down in Mushroom Village!", Finn's brother Jake said. "What do you mean? What's going on?", Finn asked. "A swarm of giant moths are terrorizing everyone!", Jake said. "Oh, jeez! I'll be right there.", Finn said as he hung up. "Thanks for dinner, Mr. Abadeer. But we do really need to go.", he said. "What is it?", Marcy asked. "Jake said there are a bunch of monster bugs terrorizing Mushroom Village. Duty calls for Ooo's hero!", Finn said. "Well, if duty calls, then you must go.", Abadeer said. "Thank you, sir. Let's go, Marcy.", Finn said as he grabbed onto her, and she flew the both of them out of the house to get back home.