Novices and newbies discussion

I’m fairly new to the world of chastity. I picked up a microcage from DHgate and it’s doing well; check out the attached picture for details. The ring sits nicely, enough room to slide a finger underneath. Circulation is fine—the testicles hang naturally with good coloration. When an erection hits (whether I’m awake or, more noticeably, while asleep), they feel tighter and darken slightly in hue. Once the hardon subsides, everything returns to its usual state. It’s somewhat arousing during waking hours but a bit annoying when trying to sleep. Is this what people call blue balls?