the_debt_of_time

"If you were so close with my parents, how come I never knew about you two
before my third year? I had a godfather this whole time, and my aunt and uncle never told
me anything."
"That's because Petunia is an uppity, little cun―"
"Because your mum wasn't exactly close with her sister around the time you were
born," Professor Lupin cut Sirius off. "She sent her a birth announcement, but I doubt
your aunt and uncle cared about any details regarding the rest of the family."
"Family?" Harry asked.
"Umm.. ."
"Yeah," Sirius replied. "Me and Moony. Family. I was practically adopted by your
grandparents, you know; Remus as well. Your dad was our brother, and your mum was our
sister. When they―" Sirius paused. When he spoke again Hermione could hear the change
in his tone: it was softer, solemn. "You should have been with me. But I fucked up, I know
that now. Still, your folks had explicit wishes. Had I not been around, you were supposed
to have been raised by Remus."
"Then why—?"
"Anti-werewolf laws," Professor Lupin answered. "The Ministry would have taken
you away from me the second they found out."
Hermione scowled at the information.
"Enough with the sad trip down memory lane," Sirius insisted. "I'm trying to impart
decades of wisdom on the lad."
"I really think you're wasting your time, Sirius. I've never even kissed a girl."
Ginny and Hermione shared a look. Ginny looked strangely surprised by the news,
but Hermione was not. Harry was incredibly shy when it came to girls, and she knew it.
The only one he had ever taken a fancy to was Cho, and he had barely had the courage to
ask her to the Yule Ball—a bit too late as it turned out.
"Really?" Sirius asked with a chuckle. "See what happens when you're off saving the
world? We all appreciate your sacrifice, Harry."
"Thanks," Harry muttered sarcastically. "How old, umm... ?"
"I was fifteen my first time," Sirius said.
"Same," Professor Lupin added.
Hermione's eyes shot wide open. Sirius, she could believe. But Professor Lupin?