giving oral with uncircumcised penis

hi all. I never imagined at 26 I'd be asking this question, but my boyfriend of 8 months just recently told me he's not circumcised. I know, I know, it sounds weird but he's always been a private guy, and now I know why. He is embarrassed by it, and apparently some of the girls he's been with have been freaked out by it. We've always done it in the dark, he's never wanted oral, etc. I've been kinda pushing him to let me give him oral, and yesterday he finally gave in, but he told me he was uncut. I did it, and he enjoyed it, but I have a few questions like what do I do with the skin? do I just pull it back?

Just to clarify, I have been with an uncircumcised guy before, but I don't remember giving him oral. That was about 10 years ago.

Any tips or tricks would be greatly appreciated