You walk in as Louis is giving Niall a tour of the house. Louis agreed to let him come home with him the day after the tour ended before heading back to Ireland to see his family, not knowing his ulterior motives.
“And this is the kitchen. Feel free to get whatever you wa— hey! What are you— NIALL!” he yells in a panic as Niall moves his arms around you when he sees you in the doorway and plants a showy kiss on your lips. You giggle and turn your head to Louis, who is still sputtering.
“Niall— that’s my SISTER. What the heck do you think you’re doing?!” he continues in a frenzy. Niall responds with a cackle.
“We’ve been dating for a year, mate.” he grins and you do the same, trying not to laugh at you older brother’s hysteria.
“You’ve been WHAT?” he asks, his voice cracking. “Well you’ve really messed it up this time, haven’t you? First you can’t even get a girlfriend, and now it’s my sister. You better not have touched her, you filthy munter.” he spits and points at Niall as he grabs your arm and pulls you away.
Niall rolls his eyes and you giggle, knowing it’s only out of his shocked anger and fierce brotherly protection that he’s doing any of this.
“Louis, let me go.” you whine with a laugh in your voice and tug your arm out of his grasp.
“We’ve been on tour, mate, don’t worry about it.”
“Don’t worry about it? Don’t worry about it??” Louis repeats and glares at Niall first, then you.
“Louis we haven’t even been in the same country!” you exclaim, trying to calm him down. “Besides, why wouldn’t you want me to date your best friend? If we ever get married you’ll be related.” you smile, trying to reason with him.
“Seriously? You’re thinking of marrying this goof?” he sarcastically spits, and you frown.
“Louis, stop it, you’re being ridiculous.” You sigh.
“No, you’re being ridiculous.” he points to Niall again. “I don’t know what angle you’re trying to pull here, but this is my sister, Niall, my sister.” he continues, but the fight begins to leave his voice. He pauses for a moment. ”And..” he starts, not able to make eye contact with you or Niall. “You better treat her right, or.. you’ll have to answer to me.”
You realize his compliance and rush to hug him.
“I love you, Louis, and I love that you’re protective over me. But you know Niall will treat me right, don’t you? I mean, it’s Niall we’re talking about here..” You hug him.
“Yeah yeah.. don’t push it.” he mumbles and gives one last glare to Niall, who laughs, knowing Louis doesn’t have it in himself to forbid the relationship even if he wanted to. He loves you both too much. But you understand he feels the need to be the father figure in your life.
You move back to Niall and kiss his cheek.
“What do you say we call up El and have a double date?” Niall suggests, winking at you.
Louis pauses for a moment before sighing dramatically. “Fine.” He says in an annoyed tone, but you know that even though it’ll take some getting used to, he’s already liking the idea of his best friend dating his sister.
