My sexy twink FWB cums and pees in my mouth

I've been lucky enough to have a really sexy twink FWB (see prior post "twink and 500 blowjobs") for the last 10 years who calls me when he wants his dick sucked. I've always fantasized about drinking his pee, but he's never let me and I was reluctant to push the issue as I love sucking his cock so much I don't want to lose him. Like a few guys I've gone down on, he ALWAYS has to go in the bathroom a couple minutes after he cums in my mouth to piss.

One day I couldn't take it any more as I SOOOOO wanted him to be the first guy who pissed in my mouth. We are always in bed when we have sex but one day, I didn't say why, but I had him stand on a box (he's very short and I'm tall) so I could kneel in front of him to blow him. He likes to grab my head and shove his cock in my mouth, and when he did, I wrapped my arms around him so I could caress his beautiful ass as I sucked his dick. A few minutes after I started, he started to moan and told me he was cumming. I got a nice load in my mouth and swallowed as usual but didn't unwrap my hands from his ass and held him close.

A couple minutes later he tried to pull away, but I wouldn't let go. He kept saying he had to piss and kept wiggling. Finally, he half yelled that he was going to piss if I didn't let go, which of course I didn't. He then just moaned, "ok, you win--you better drink it all" and he started to pee in my mouth. I have never felt anything so wonderful as his warm sweet piss filled my mouth and, as hard as it was to swallow with his dick in my mouth, I managed to drink all but a few drops that slipped out.

When he was done, he whispered, "Oh, wow" and told me he thought it would be gross to watch a guy drink his piss, but said he actually liked it. Since then, he almost always lets me drink his piss after he cums in my mouth. Most times now, however, he enjoys it more when I kneel in the tub and he keeps his dick about 6 inches from my mouth so he can watch it fill my mouth. He's gotten really good at pausing when my mouth is full and gets excited at watching me swallow. Best part now is, when we're together and he has a few beers and he starts peeing every 20 minutes or so, I get to enjoy swallowing numerous times a night.