Old Romance Book with Two Lawyer MCs

I don't remember the main plot because I've read this back in grade school so more than a decade ago, but I know it's an old book maybe 90s, because it was softbound and it was already tattered when I stole it from my aunt's collection.

The FMC and MMC are both lawyers who are on opposite sides of a case. The MMC is from another place and he went there just to represent the other side. He's described as tall, dark, and handsome. FMC is petite and has this fierce personality. I think her name is Amelia but I'm nottt sureee.

It's an enemies to lovers story because they're on opposing sides.

There's an angry confession scene in the rain. Their cars basically met on the street and they both went out to argue and they stood close to each other then shared a kiss in the rain.

The FMC also has a sister whom she has a talk with. The sister tells her something like "look at my husband now, they told me he'd be bad for me but here we are now" something like that.

i can't remember other details because it's been more than 10 yrs since i read it but I still can't forget it. It was my favorite book ever. My classmates borrowed it back then and never returned it. Smh.

it's 2am and I can't sleep cuz I'm thinking about itttt please help me