HP: Regulus Has a Lover from Another World

【Two male leads + original-era setting + daily life + next generation + Slytherin + multiple worlds converging + OOC】 When two worlds merge and someone from outside the original story appears, will everything still turn out the same? Regulus: He’s special. He’s nothing like anyone I’ve ever met. He doesn’t flatter me or go out of his way to please me. To me, he’s completely different! Everyone else, watching Regulus: You hopeless lovesick fool!!! Elias: Hehe, what a handsome young man. I like him, I like him. Hehehehehehehe... What? You’re saying I’m not good enough for the heir of the Black family? I’m the best there is, and no one can tell me otherwise! I’m good enough for anyone! Elias is a puppy with an absolutely sky-high sense of self-worth!