Am I wrong for this?

My previous post for context: https://www.reddit.com/r/Incestconfessions/s/NpMao64pAD

I feel embarassed for doing this, but when I'm horny af, I just can't control myself, I just keep jerking off in front of my grandma, she doesn't even say anything, and that's what turns me on even more, I casually chat about my dick size, etc.

What would you do?