idk what to do

so there’s this guy that i like and he likes me back. so we were talking one night and the next day i was supposed to go to his house to hang out (we’ve been friends for a long time and i would always go to his house just to hang out and nothing naughty would happen we would just chill) so he texted me and asked if he could eat me out. i’ve never been eaten out before and i wanna let him but i don’t wanna embarrass myself at all.