Weird? Naw. Kinky? Yes. A bit freaky? Absolutely.
Both traits that many a man would like. Of course there are a few guys out there who would run like the wind but those obviously aren't the kind of guys you want to share your chicken with.
So about telling your boyfriend...why even tell him. Why not just grab his fingers and lick them seductively. Then you've got the thrill of surprise on your hands as he looks on and is (likely) turned on by that even more. I'd wager that dude will probably do a fist pump in his head and smile at you.
The less words shared in this instance, probably the better. Just to see his reaction. Trust me, if it throws him off, he'll say something later at which point you can say you were just as surprised as he was that you did that. Then you can get into a convo about it.
And after you do it for the first and your boyfriend isn't shocked by it (I really don't think he will be - a lot more women like to "taste themselves" than you might imagine) you can casually mention it via conversation as you all talk about sex and things that you do like. Just be coy like women like to do and he'll never be the wiser and think he has him a wild one on his hands. No Flo-Rida.