Look up Ironlily. Most of her works are slice-of-life wholesome drawings set in a fantasy medieval European-like military camp but everyone is a cute girl (including a landsknecht with a sus codpiece). Toplessness happens casually in non-sexualized ways such as at bathtime but it's not common. The girls show varying degrees of fondness and romantic pursuit among each other, and it never gets explicit. It's arguably ecchi but as mild as it gets.