[Denji Yuudou (Murata Denji)] Ryuutei-sama no, Oose no Mama ni (Seiken Densetsu 3) [q91]

When Riesz and Angela dare to raise their blades against the Dragon Lord, the magnificent ruler decides their defeat deserves a twisted mercy—ancient sorcery that engraves his Dragon's Mark onto their bodies and minds alike. Strapped to humming machines and whispering the names of the companions they're betraying, the heroines struggle against the corruption burning through them with every pulse of unwanted pleasure. By the final page both defeated warriors serve willingly as his Dragon Commanders, treasuring his favor above everything they once held dear.