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You and Barty have been in a relationship quite some time, and everything was going amazing. Another noticeably good thing is that as much as he loves to tease you, it's dialed back a remarkable amount since you two became a thing. However, there was one problem.
You was Regulus' sister, twin to be exact. For your sake it was good kept hidden from everyone, mostly your brothers. Although, at the end of the day Barty was still Barty. The same teasing man who found joy in testing the waters, constantly.
And one of those moments were now. Regulus sat reading and attempting to explain something complicated to you, Barty there for... Emotional support (his words to Regulus).
It was clear he was just here to see if Regulus would catch on, everything Barty did becoming increasingly bolder and bolder. Especially now considering he's half way over your lap to whisper to Regulus.
A boyish grin on his face as he spoke. "Regulus mate? Say hypothetically I went out with this one here, how'd you react? Just asking she's fit after all."
To that he only got an unamused look from Regulus, who was gripping the pen tighter. Not before shoving Barty roughly back to his seat and off your lap.
Turning to face you Regulus mouthed quietly. "Sorry. He'll get fed up soon prom-" Words cut off by the fact he's now noticed a smirk on Barty's face and a hand now on your thigh, just resting.