And so, whenever Remus did anything remotely alluring—whenever he ran his long fingers through his hair, mussing up his golden curls; whenever he made a ridiculously charming joke and gave Sirius that sexy grin; whenever he sang beautiful lullabies to his adorable baby in fucking Welsh for fuck’s sake—Sirius would redirect his mind to the mighty Beowulf and his clashes with the wicked Grendel. Sirius’s jaw would slacken, his eyes would go unfocused and...