The Last Truth

Regulus must tell someone about the Horcrux. He knows he'll steal it; he knows he'll die. Actually, he'd rather die then be a Death Eater. But he can't die without telling SOMEONE. But who? Sirius? No. Dumbledore? No. The only option is one of Sirius' old friends, Remus Lupin. But will Lupin understand? NOT slash. AU. Rated for Swearing. One shot.