They are about 16 here, nothing actually happens which is why it's not tagged as underage

So on RuPauls Drag Race (let's find the best Drag Queen competition) in one of the series a contestant gets asked 'How's your head?" I think it was like a Halloween themed week so they had a (fake) wound there, but one of the other judges replied with 'haven't had any complaints' turning it into having a double meaning (head=blowjob) and it took the Drag Queen in question several weeks to understand what was actually being asked and give the "correct" answer so this bit of crack came from my thinking about Dazai misunderstanding Chuuya when asked that...

"How's your head?" Dazai asked concerned, for Chuuya it was a 'light' injury, but he would be a terrible partner if he didn't at least ask.

"Haven't had any complaints," Chuuya smirked, his tone was flirty.

"Hmm we may have to take you to Mori, you've clearly got a concussion or something."

"I'm fine!" Chuuya yelled, blushing as his meaning had gone straight over Dazai's head.

"Okay-okay! I was just checking." Dazai grumbled.

****

Dazai's was in his office, finishing off some paperwork, as Chuuya came in, Dazai groaned and started rubbing his forehead.

"How's your head?" Chuuya asked, knowing Dazai was always looking for a distraction from his work

"Achey, probably a headache, but fingers crossed for a brain eating slug!"

Chuuya sighed, that hadn't gone how he'd planned, so he settled in and helped Dazai finish his paperwork, even managing to get some paracetamol down him for the headache/brain eating slug.

It went on like that for weeks. Dazai would check on Chuuya and get the flirty answer, and Chuuya would get increasingly irate when Dazai wouldn't answer correctly when asked.

Chuuya could have just asked Dazai instead of going for the vague double entendre. But as Dazai had a bit of a reputation of bedding anything that moved, Chuuya was a bit afraid that Dazai would see him as too inexperienced compared to himself, and refuse him. Although Chuuya enjoyed sex as it was the only thing he could lose himself in and would have a happy ending for all involved.

Chuuya tried a different tactic, noticing that Dazai only openly flirted with people when there was an audience, so he waited until the next mission they had together. They worked with a team of ten men and Hirotsu, the mission completed successfully. Dazai was dusting himself off, as Chuuya sauntered over to him.

"Hey Mackerel! How's your head?" he even threw in a wink to try and sell the question,

"I…it's attached to my neck? It's covered in bandages? Probably got some scratches to?" Dazai asked, confusion clear.

"You mean those skills don't earn you praise? You don't get any complaints?" Chuuya tried to lick his lips suggestively, eyeing up Dazai's dick. The other's present had picked up on what Chuuya was asking, and were slightly in awe of his confidence. However, it was lost on Dazai, who was still trying to answer Chuuya's original question.

"Why do you keep asking how my head is? Every day for weeks, are you attacking me in my sleep or something? Or is Mori worrying again?"

Chuuya's phone going off saved him from answering, Kouyou needed him for another job, so he quickly said goodbye and left, leaving Dazai to go back to headquarters with Hirotsu. After a few minutes of quiet driving, Dazai broke the silence,

"Hirotsu?"

"Yes?"

"What am I missing? What is Chuuya actually asking?"

"You don't know?"

"No? Why should I?"

"I told Mori the younger members would miss out on a proper high school experience."

"Huh? What do you mean?"

Hirotsu sighed, trying to pick the best way to answer, "I think it may be best if you talked to some of your younger friends, I'm sure they'll be able to answer you. Maybe ask Ango and Sakunosuke?" Hirotsu knew the two men would answer Dazai honestly, and only tease him slightly. Dazai ignored him,

"Hmmm I'm seeing Ane-san tomorrow, maybe she'll know? I mean Chuuya's under her teaching."

"No!" Hirotsu blurted out, he knew if Kouyou found out what her charge had been implying, she would not be happy. "I'm sure Ango and Sakunosuke will help, aren't you seeing them tonight?

"I am, okay, I'll ask them, thank you Hirotsu"

Odasaku and Ango were at the bar before Dazai arrived, his drink waiting. He greeted them, took his seat in the middle of them, then downed the Whiskey,

"Tough day?" Odaskaku asked.

"Chibi keeps asking how my head is, or answering haven't had any complaints, if I ask him the same thing when he's gotten injured. Is it code for something? Did I miss that lesson?"

Ango and Odasaku tried to withhold their laughter, they knew of Dazai's reputation but it couldn't be further from the truth. The interest in dating may be there, somewhere, but it wasn't on Dazai's list of priorities at this point.

"Haven't you heard about someone 'giving head'?" Odasaku asked

"He wants me to give him someone's head?" Dazai asked, confused, "but we don't do decapitation, Mori claims it's too messy."

"It is," Ango replied, trying not to laugh at Dazai's confusion.

"Will you two please just explain it to me? Hirotsu-san wouldn't, he just muttered something about me missing out because I'm not in school, then told me to ask you guys."

Ango sighed, "It's an act for the bedroom Dazai,"

"Or car, or alleyway, hell even this bar," Odasaku interrupted.

"So, it's not decapitation?!"

Ango chose to ignore Dazai's question, "Your partner, male, female, whatever, uses their mouth on your penis-"

Dazai choked on his drink at that,

"-and it's pleasurable. It's a similar concept to using your hands, but better."

"It's slang for giving a blowjob" Odasaku added.

Dazai looked mildly horrified,

"He wants me to do what?!"

"Well you do have a bit of a reputation Dazai," Odasaku tried to explain

"and you can be a bit flirty" Ango added

"But it was supposed to stop things like this." Dazai groaned.

"Just talk to him, I'm sure he'll understand" Odasaku tried to comfort him.

It was two days until Dazai saw Chuuya again, they completed their mission quickly then returned to Dazai's office to do the paperwork. They worked in silence, Dazai trying to work out how to bring up his new found knowledge.

"You're too quiet, what's wrong Mackerel?" Chuuya broke the silence

"I'm fine," Dazai mumbled.

"Really? Cos you've never been this quiet, had a busy weekend did you?"

Dazai tried to ignore Chuuya, who had put down his own paperwork and was getting closer to him

"I mean, how do you even get women with an attitude like that? Or are you just that good?" Chuuya was now within touching distance of Dazai.

"Don't!" Dazai yelled, "I'm not going to put your dick in my mouth! I mean you pee out of it, why would anyone want to do that?!" Dazai's disgust came through in his voice.

"Oi! I wash thank you very much, with soap and everything"

"I don't care." Dazai paused, "Slug? You do know those rumours about me are false…right?"

"No?!" Chuuya yelled, and moved away from Dazai giving him his space back.

"Yeah, I… well at this point I don't really care about any of that, I'm not sure if it's how I'll always be or if it's just who I am now, but sex, dating, romance all of that isn't a priority now." Dazai explained quietly

"Well, if you change your mind and want to explore, I'm here." Chuuya grinned winking.

"I'll keep it in mind. Now, is Chibi gonna be a good dog, and do this report for me?" Dazai smirked, the mood going back to how it was before.

*****

Several years later, after Dazai had grown up a bit, he found that blowjobs weren't as unpleasant as he once thought. Chuuya, of course, teased his boyfriend mercilessly about the change of heart. Although he was glad it had never worked out in their teenage years, now, he got to date the happier Dazai.

(and of course, Chuuya didn't have any complaints)