Hi!
In the current version you (female MC) is the sub in all nsfw scenes with bdsm. The dom is always a male.
There is one scene where you can choose to just have "vanilla" sex with the man (demon) instead.
There is one voyerism scene where you witness a male dom, female sub, bdsm.
BDSM in the context of the game means that most sex scenes involve some sort of power dynamics, ropes, bondage and/or submission. There is no "outside of sexual context" type of dom/sub relationships explored.
A lesbian playthrough might be possible in the future, because all nsfw are optional and your choices. It will affect the story and what paths and available though. However, right now, there is no lesbian content yet. I might add such scenes where it makes sense (2 future chapters and NPCs comes to mind).
Tags for nfsw in version 0.3.0 would be: Rope bondage, blowjob, vaginal sex, chains, voyerism, bdsm, spanking, female sub.