He wants me to drink his pee

Last night, my boyfriend and I got drunk, and he told me he wanted to pee on me one day. I was fine with that, it's not my thing, but I'll try it. Then he told me he wanted to pee in my mouth and watch me drink it. I'm not really sure how to feel about that part. I want to do it because I like pleasing him and having adventurous sex (we regularly do anal, I'm actually buying a strap on when I get paid to use on his birthday, he chokes me, spanks me, whips me, I call him daddy, etc), but I'm not sure if I can handle it. I've never tasted pee before, so I don't know if I'll gag or vomit, and I don't wanna offend him like that. I absolutely love that he opens up to me like this because I was a virgin when I got with him whereas he had a lot more experience. I know number of partners doesn't really matter, but I like being the only girl he's done these things with. I always say I'll try anything once, and I didn't think I'd like anal when we started doing that, so maybe I'll like it. Does anyone have any experience with this or words of encouragement for me?

UPDATE: thank you all for your kind words! I was really hesitant about posting this here, but I wanted to talk to someone about this, and I thought my friends might be judgmental (which same case here but at least I can be anonymous). I've decided that I'm going to start off slow, per your recommendations and see where it goes from there. If I remember, I'll try to update afterwards, but I won't be seeing him till Friday, so no guarantees I'll remember. Any tips? I'm thinking I'll sit in the bathtub to lower the mess and make it super easy to clean, then we could shower together and go from there. Obviously it'll be more spontaneous than it sounds, but I don't wanna walk into this completely clueless. Again, thank you, ladies!