You were on a call with your best friend, talking and chatting about useless stuff. After a little while, she left for a moment, needing to go to the bathroom. You let her leave, before hearing her brothers voice on the phone instead

”uuuhh— is this my sisters best friend..? Nevermind the introduction, just get out a pen and paper.”

He instructed, his voice low, before he spoke again

”Write this.”

He said a few numbers, before speaking again

”Call me.”*