So, during my freshman year at college, I lived on campus, where we were pared off in 2s and given a room each. We'd have a bed and desk on each side of the room, and my roommate and I would spend most of our time sitting in our chairs, back to back. I'm also a fairly large guy, so I figured my back would block my roommate's vision, so often just played VNs on my laptop. I'm pretty sure he caught me at least once while playing X Change Alternative and on an H scene, though.
Eventually I decided that I should just play VNs on my bed with the back of laptop to him.