3 Works by Benevolent_Despot in Haikyuu!!
The entire team watched as Hanamaki held his phone out to Oikawa, who took it tentatively. Looking down at the screen he was more than a little surprised to see that they hadn’t been looking at a picture or video at all. It seemed to be a normal website. His relief vanished as he read through the site. He could feel the blood draining out of his face as he skimmed the rest as quickly as possible.
“W-w-what is this?” he stuttered. A few people shifted uncomfortably, as though not admitting it aloud would somehow make it go away.
“Your fan club has an entire website dedicated to you and Iwaizumi.”
Or: After Oikawa discovers Oikawa/Iwaizumi fanfiction, he decides to try his hand at writing. It goes about as well as could be expected.
“You didn’t answer my original questions, Iwa-chan,” he said. “How do you feel about sex?”
“You mean how do I feel about having sex with you.” He shot Oikawa a glare.
“Well, yeah.” Oikawa rubbed the back of his neck sheepishly. “That too.”
In an attempt to give his friend and future mate time to consider what he wants, Iwaizumi lies about wanting to bond with Oikawa, Oikawa decides to take matters into his own hands, and it all goes to hell from there.
Oikawa let out a haughty sniff and turned his head away. “What makes you think that I’d let you be my alpha?” he asked, jumping when Iwaizumi let out a bark of laughter.
“’cause no one else would be stupid enough to be stuck with you,” Iwaizumi chuckled, and Oikawa stuck out his tongue.
“You’re still here, though. Doesn’t that make you stupid, then?”
Iwaizumi thought for a moment. “Yeah, I guess it does. But you wouldn’t let me leave even if I tried."