Even Though I Become A Side Character, I’M Being Adored By An Overprotective Duke

*I was reincarnated as a mob character from an otome game, and my fianc is a handsome duke.* I've been transmigrated as "Leticia," a mob character from an otome game. I was forced to take Lionel as my fianc by my twin sister (who, by the way, has the worst personality). The first time I met Lionel, he was nothing but chubby and fat, just as the rumours said he'd be However, me being me, I realised that Lionel is an unpolished gem with potential to shine, so I decided to re-invent him. Even if I'm a mob character, my days of doting on my fianc began when my fianc transformed both inside and out.