This really felt forced to me...did the author feel "oh no, I'm losing my audience" and make a hard turn towards fanservice? It's only chapter 3...ish. The story started out more psychologically with some character depth and development, and here we are just a couple chapters later with "ohhh noooo, it's all dark and naked and sexy in here and boobs boobs boobs".
I just hope this was a bit of an attention grab and it'll shape back up, but who knows. I don't at all mind seeing things get physical at some point, but this really seems rushed and quite a tone shift from the first couple of chapters. It feels more like an excuse to peep on girls touching each other than exploring a nascent lesbian relationship.