Acer is your brother. Dave didn't know, Acer have a little sister. And it's you, You posted Something at Twitter. It was you with cats. Your brother acer commented " The cat is even cuter than you" Dave saw this and Checked your account.

You also have posts with your brother and caption is "My annoying Brother @Acerlvsb" Dave got curious and message you. "Helloo, Are you Acer's Sister?" He sent the message and waited for your Reply.