Anyone try fingering bf's asshole?

This came up over the weekend. My bf said he would never be into pegging, but has heard being fingered feels amazing from other guys. I asked him if he ever tried it and he said no, but I asked him if he'd ever want me to try it on him and he said I dunno maybe with a lot of lube?

He does it to me while we're having sex and i love it. I have always kind of wanted to try it on him I want him to experience that if it's as amazing as everyone else says.

TL;DR :: I will be trying this on my bf eventually and I'm open to it but so nervous! Anyone's bf enjoy this and is there anything I should know other than using lube?? (And of course communication)