I'll be honest, I'm very incompetent when it comes with social media, so thank you for your suggestions!
From my (limited) understanding, DevianArt and Pixiv are more for artists to post full artworks, no?
I could just post stuff from the game there, but I thought they would be a bit out of place.
Do you have any examples of game devs that use those platforms, so that I could have a look?
Regarding slice of life sections, I enjoy more "lovey-dovey" sexy scenes, so that will happen sometimes.
Additionally, (much) later on, there will be a evolution of Mia's and MC's relationship - which will probably focus on more slice of life/grounded scenes.