⁉️Anal & Fingering⁉️

So my boyfriend and I were fucking and in reverse cowgirl and he said that he wanted to finger my ass and I wasn’t sure if he was serious and we just like kept going on and he didn’t...BUT... today we were talking and he said how next time I’m in reverse cowgirl he wants to finger my ass. I’m totally up for trying new things and I would love to start trying some anal stuff but I’m scared that when he fingers me shit is gonna be on his finger and if that happened I would be so embarrassed and we’ve been dating for 2 years now and I’m really comfortable with him but if that happened..idk I would just be very embarrassed. So what do I do, what prep stuff do I do. Is the only thing to do to be safe is the enema? Please help haha