Note on the timeline: this story takes place after volume 6 of the DxD light novels (roughly season 3 of the anime) and after the To My Child ending of the School Days visual novel (more or less the anime, but Sekai is alive in this one.) Enjoy.
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"I'm telling you, you have to teach me Dress Break," the boy insisted.
"I don't know," Issei said. "Can I demonstrate it on your queen?"
Since the two of them entered, Issei's eyes had periodically trailed towards the gorgeous girl.
"Alex," a harsh voice interrupted them. "I thought you wanted to speak to me."
"Uhm, yeah. This is kinda embarrassing, but uhm. Well, I don't have a familiar...yet. You know, I have to wait for the full moon, and that boy from Sitri apparently called dibs."
"You're a king now," Buchou said. "Are you gonna let a pawn tell you what to do?"
"No. But Sona-sama is scary. I like her sister, but the younger one is just scary."
"You want me to talk to her?"
"No. I can take care of it myself. But I'll have to wait for at least the next full moon. Look, can I borrow your familiar? Just for a couple weeks. I need to hand out flyers one way or another."
"Why don't you let your queen do it?" Buchou asked.
"Well. Serana is a vampire. She really hates sunlight. She's only half Daywalker."
"You could do it yourself," Rias suggested.
"Me? I can't just walk out without protection."
"That's why you have a peerage."
"But how can I built a peerage if I don't hand out flyers? How are people supposed to summon me?"
Rias Gremory sighed deeply. "Fine. But don't mess this up."
/
"I didn't know you had a little brother," Issei said. The boy had just left.
"That's because I don't," Buchou said. "He's a half demon. His mother was a human with a Sacred Gear that allowed her to change her looks and her voice. She loved to pretend to be the wife of a high class devil. Lord Bael got her pregnant this way and had her killed afterwards. He wanted to kill the child too, but father stopped him. He argued no one ever had to know the boy's true identity.
We dyed his hair and told anyone he was our little brother. Now that he's reached sixteen, my parents made him a King and let me look after him. He is supposed to help me, but I'm not sure he'll be of much use."
"Well," Ise said. "That vampire certainly looks...useful."
Said vampire looked at him and hissed softly.
Ise swallowed his spit. Apparently not all vampires were as sweet as Gaspar.
Maybe that was for the best.