Lesbian scenes are hot and make perfect sense in the world setting, it's explained well and fits part of the world building. My initial concern was just based around effort to ground the MC background and plot. That said I do have only one ask, please consider when creating any forced sharing/cheating narrative for love interests, that it's optional regardless of gender or at least optional for the main love interests (if it has 1 or even more main LIs). Cheating is meant to hurt, it's non-consensual after all and that is what impacts the reader.
I look forward to what's to come!