Girl gets reincarnated into the body of a villianess and ends up sleeping with the ML. Then ofc they end up in a relationship and fuck man, real couple goals. Subtle smut ( ͡° ͜ʖ ͡°). The setting is also pretty neat, along with the magic system. It's not the typical combo of historical europe + a magic tower slapped atop, like most of these shoujo isekai.
The Evil Lady's Hero