Rodolphus' Dirty Mind

Rodolphus has a fantasy that feels so real. In this fantasy he has Regulus Black at his command and willing to do anything he wants. But Rodolphus really enjoys playing dirty with his toys. What does it matter to him? It's all in his mind anyway. Right? Written for Septemeber's Writing Club's Sophie's Shelf. Warnings for Smut. Big time smut ahead.