I am 15.

I've been masturbating for well over 3-4 years now, may or may not be proud to say for every day of the week.

4 months ago, I had gone through a healthy and normal ejaculation and was just about to clean up, when all of the sudden, a half-brown half-clear stream of a gooey, odorless discharge began to leak out of control from my penis, completely painless. I knew very well that this was not my ejaculate, and it kept on leaking, for nearly 40 minutes. In a panic, I struggled to find a way to end this, and so decided to masturbate once more, as perhaps a second ejaculation would get rid of this. To my surprise, I succeeded, or so I thought.

Every day since then for about 2 months, the same discharge would leak from my penis in very small spurts, and about once a day. The first few weeks this had happened, this discharge was a darkish brown, but over the course of a week, it had permanently lost its color and became completely transparent. Furthermore, I could tell when this discharge was about to come out, as certain angles when I sat down would allow me to feel a small, painless pressure on the area just behind my testicles. 

Finally, I decided to tell my mother who then calmly scheduled an appointment with a doctor. About 2 weeks later, he concluded with a urine exam that this is not a UTI. Furthermore, I had a kidney ultrasound that ended up giving no clues as to what this mysterious condition is.

To my excitement, I began noticing that this discharge would start fading away on its own... and instead, would only follow a few minutes after an orgasm. Basically, I no longer have to worry about messing my underwear if I'm just going out for a walk or sitting still, but would have to be cautious of the, once again, painless discharge that would follow if I ever decided to masturbate. 

Doctors have decided to send me to a specialist in a children's hospital who may help with this endeavor.

I only now started REALLY worrying about it since after yet another of my ejaculations, I noticed a small bead of the discharge peaking from my urethra, to which I intended to brush away, only to find myself pulling a looong rope of this stuff straight out of my urethra. 

Again, I've felt absolutely ZERO pain throughout this 'exciting' adventure. A full description of the current discharge; Colorless, odorless, very sticky, able to stretch a whole lot, looks similar to a spider web strand.

P.S: I have noticed that my regular ejaculation have become incredibly clumpy. They used to be somewhat watery, somewhat fluid, but now, it's somewhat dry and 'solid' in a way, though I think 'gel' is much more appropriate. Again, no pain.