When I was 13, I got caught reading my mom's erotica. We pretended it never happened but I still feel dirty.
What kind of erotica was it?
It was about the naughty things she did with her lover at the time.
Well, hopefully you learned not to rummage through your mother's private things. It can lead to awkward situations like this one.
I took it as I was just curious.
Curiosity killed the cat. It's best that you don't bring it up at all.