ham it up, read more of it, be more shameless, pretend ur not dying inside,
ignore every last piece of advice i just gave you (or not, i's your own life)
genuinely it's not that big of a deal - a real friend will stick with you through thick and thin and every embarrassing thing. Plus if you were in your room then it doesn't really matter - you can do what you want there. Besides that will never be as bad as introducing someone to The Milk Fic, then that being the first thing they bring up after reconnecting for the first time in 6 years.
(and seriously, all they'll think probably is "good for you tbh")
if ur friend caught a glimpse of u reading an explicit scene from a bl manhwa (a dude riding on another dude's dick) then u panicked and they said quietly "it's okay", would u text them afterwards saying something like "hey can we act like nothing happened" (for context i live in a very conservative country & society)