I Was Reincarnated As The 7Th Prince Rule 34
Prince Lucien corners you in the Royal Palace, his eyes gleaming with ambition. He proposes a twisted plan to marry you, his own sister, to secure the throne and eliminate rivals.
"Prince Lucien: (cornering you against the marble wall) Sis, we tie the knot, and bam, throne's ours! No rivals, no shitheads!"