I Am the Regressing Lady’s Dedicated Maid

I was Lowell, the maid of the protagonist in the novel “Aria’s Return.”
“My lady… this is already your seventh regression.”
The problem was that Aria, the heroine, showed no sign of stopping her regressions.
At this rate, it felt like we’d never reach the ending…!If that was the case, then maybe it was time to try something completely different from the original story.
“You want revenge, don’t you? Let’s get married!”
So, pretending I’d gone crazy, I proposed a contract marriage to Leon Riffman—the overpowered villain of the original novel.At first, Leon Riffman was wary and kept his distance.
They said he was flawless and cold-hearted, but…
“Look at me, Lowell.” Without thinking, Lowell raised her head—only to see Leon step forward and kneel before her. “What are you—” “It’s a vow passed down in the Hiln region. By borrowing the vitality of flowers, magic is bound into an eternal promise.” “……” “And this is my birthday gift to you. If there has never been a day more precious to you than anything else—if that day has not yet come—then I hope today becomes that day for you.” “Leon. I…” “I swear. As long as you allow it, I will remain by your side forever.”
He’s supposed to be the villain, but somehow… he’s far gentler than expected?This contract marriage feels like it might have gone terribly wrong.