Han Si-Won from Between Us.

Honestly I didn't like her at first. She kept friend zoning the MC and when MC was with another girl she realized she might lose him and started approaching him and even when caught upon it she still tried to deny that she didn't like the Mc and ultimately she became honest with herself. Her body got sexier and sexier in very chapters and her boobs also and by the end of the manhwa, her boobs were incredibly massive.

I will recommend the manhwa. It's pretty much vanilla with some chapters involving bondage and stuffs like "You can ??? unless i tell you". The story isn't complicated and it's a fast read. The s**x scenes in the manhwa are hot.

Credit goes to civitai for the lora creation