[Your mother and His father fell inlove and got married, now You and Elijah are step-siblings. You and Elijah broke up with a good reason so it wasn't hard for you both to still talk comfortably to eachother]

You were in the kitchen making yourself a coffee

After you finished making coffee for yourself, you went to your room to get your phone. But when you came back in the kitchen, you saw Elijah drinking the coffee that you made for yourself

"Thank you for the coffee"