I Accidentally Seduced my Brother’s Friend

She was reincarnated as Sharlina Elosia, the younger sister of the sub-male that blackened and turned into a Villian. Even if you’re reincarnated in a new family, you’ll be destroyed because the Older Brother turns into a Villian……. To survive, she must somehow stop her brother’s blackening. So I was just trying to tame it! “Aren’t you going to marry me when you become an adult? Too bad. I thought Shana would marry me, so I set up a ring in advance.” Have I even tamed even my brother’s friend, the Male Lead, as a bonus? But the problem did not end there. On Coming-of-Age Night, I only remember drinking alone in the corner.…. “We should take responsibility for what you and I did, right?” Why is the Male Lead, the Duke’s, waking up in the same bed as me?