Question for men. Why does it feel uncomfortable on my bellend after masturbating? Almost like I need a piss

Question for men. Why does it feel uncomfortable on my bellend after masturbating? Almost like I need a piss

Not an STD, I’m all clean. It doesn't happen often and worse if I have drink lots of water. Like a burning in my bellend, relieved when I’m peeing but then comes back. Lasts about half hour. Heavy loader don’t know if they makes a difference.