Apparently, the pose on the final page is known as "Yuri Cosmic Symbol" 百合太極図
Oh, huh. I didn't realize that was a thing, and yet now i realize I've seen it dozens of times. Weird.
Also for the curious, I think that the box Aya pulled out is a Marshall Emberton II Bluetooth speaker. The grille doesn't quite match, but it's the model with that big fat single button on top.