One time, Sirius kept pestering Remus so much, trying to apologize for the prank and Remus was just so tired of hearing his voice. He turned around and punched Sirius so hard, a black eye was sure to form. And Sirius wasn't scared, didn't cry. He'd been used to this from home. He fully believed that he deserved a black eye.
//No hate to Remus, I swear. I just feel like he's definitely lost his temper sometimes and one time had been on Sirius during the prank time.