Title: The Scientific Method
Fandom: Diabolik Lovers
Rating: T
Length: 715
Author notes: Warning for Half-Sibling Incest.
Summary: Subaru swipes one of those girly magazines from Yui to see what the fuss is all about and he stumbles across some idiotic article that claims 'being a good whistler makes you a great kisser.' Shu takes immediate notice and wants to test that theory, much to Subaru's embarrassment.

"This is so stupid," mutters Subaru as he flips to the next page. "Do humans actually find this stuff attractive? It's gross."

His oldest brother lounges on the couch behind him with a piece of jerky hanging from his mouth. Munching loudly on it, he rolls onto his side and peers over Subaru's shoulder. "Why are you reading it, then?"

Subaru shoots him a glare and retorts, "This magazine isn't mine if that's what you're implying!"

"I never said it was yours." Shu takes from half-eaten jerky from his mouth and chuckles. "I was just wondering why you're reading it if you find it so repulsive."

"I just wanted to see what Yui was flipping out about at school earlier. Tch." Subaru skips yet another article featuring celebrity gossip with a groan, "I shouldn't have gotten my hopes up."

Shu leans back on his cushion again and starts to whistle softly. It's still not something that Subaru is accustomed to; Shu is usually quieter than a feather wafting to the ground, but since the change in their relationship, Shu is perkier than ever.

Sighing, Subaru flips through the magazine one last time in hopes of finding a relatively decent article when he stumbles across something unexpected. Blood drums in his ears as he fumbles with the pages and tosses the magazine to the floor with a huff.

"Like I said, s-stupid..."

"Eh? What are you worked up about now?" Shu sits upright and looks towards the discarded magazine. "Was it something dirty?"

"Hey, what are you doing?! Don't!" Scrambling around on the carpet, Subaru struggles to snatch the magazine out of Shu's reach and fails spectacularly. He leaps to his feet and attempts to swipe it away once more, but Shu is simply too dexterous for him. "It's not a big deal! Just give it back!"

Shu plops on the couch and turns to the wrinkled page Subaru was just perusing. "So that's what it was." His blue eyes flick down and meet the crimson irises of his brother's, embarrassment evident in them. Teasing Subaru is too much fin as it is, so he decides to indulge himself with a smirk. "Being a good whistler makes you a great kisser, huh? Interesting."

"Don't get all high and mighty just because you can carry a tune," grumbles Subaru, turning his back to Shu and leaning on the couch's edge. "It's probably a bunch of bullshit, anyhow...just like the rest of those articles."

"Want to test that theory?"

Subaru crosses his arms over his chest and scoffs, "Ha! Yeah, right."

Whistling another spirited tune, Shu drops the magazine and plucks Subaru from his comfy spot on the carpet so that he's with Shu on the couch. The younger vampire puts up quite a struggle, thrashing and cursing loudly while Shu subdues him with gentle ease. Eventually, he gets Subaru beneath him and has his wrists pinned above his head, and he's still whistling.

"Stubbornness isn't a quality I enjoy in most people," he says with another smile, "so thank your lucky stars that it makes you so cute."

There isn't time for further protests as Shu lunges in to claim his prize. Subaru's lips are chilly and taste like mint because of the candy he wolfed down earlier, and Shu actually doesn't mind the sweet, crisp flavors dancing on his tongue. He pries Subaru's mouth open a little more with the pad of his thumb against Subaru's chin, prompting another grunt. Subaru moves his hands from gripping Shu's sweater to his broad shoulders instead. It's a shameful position to put himself in, but no one else is around; he's allowed to drop his guard around Shu and Shu only.

Shu finally pulls away with a distinct, wet 'pop.' A viscous trail of saliva strings his and Subaru's lips together, and saliva is also slathered all over Subaru's mouth. Shu just smiles down at him and asks, "Was the article right or wrong?"

"The correlation between whistling and kissing is still a load of shit," mumbles Subaru as he sits up, still beneath his brother, and wipes saliva from his face with the back of his hand. "Y-You've always been a good kisser, idiot. Happy?"

Laughing gently, Shu leans down t push his forehead into Subaru's. "Maybe."