How My Cock Gets Hard

My parents went camping for the weekend and I had to work on Saturday so I was home alone. I'm very visual when it comes to arousal and I got this wild hair to watch my cock grow from soft to hard. I found my dad's shaving mirror, the kind on the stand with normal and magnified sides, and got on the bed. After a few attempts to get it placed and tilted right, I was ready to watch it grow.

As soon as it stopped being hard.

So now my dick won't go down. I'm lying there wearing white cotton socks only, my head against the head board and the upper part of my back supported by some pillows, with my legs spread and half bent. I've got a view of my shiny cock head in 3D in front of me and my nut ball and the bottom side of my dick up to the crown in the mirror, normal side, beyond.

Still waiting.

I picked up some boring book and after reading a while, could feel the head nuzzling back between my drooping nutsack. I peeked around the book and it was only quarter hard. Still not enough. A few more pages and I was probably as soft as I could have gotten given the circumstances.
It starts pointing away from me with the head lying just above the valley between my balls when the sack is relaxed. I start thinking about (I'll let you guess) and it starts heading, still curved, downward in between my nuts. About quarter hard it starts jumping weakly and the head lifts as it straightens. Jumping a little more noticeably it rolls over to the left (always) and almost turns upside down as it continues to grow. Its long enough now to hit the bottom of my left leg under the lone, thin, prominent muscle attached to the front of the pelvis. Another cock jump or two and it clears my leg. Nearly full length now it's getting fuller and rotating around to face me as it's elevating away from my body. The head fully blooms just before it reaches my centerline and it punctuates the scene with small jumps once it's there.
All that time my nut sack has gotten a little shorter (nuts moving up) and I see the hairs on it moving back and forth. Never noticed THAT before! Looking in the mirror, I see my nut sack skin moving like invisible fingers are massaging it in small circles.
The precum glistens at the opening soon after it's erect. If I keep my hands off, the pre will eventually drip down to the edge of the crown then detaching and meandering down toward my pubes.