Andrew fully follows Ashley's Tumblr, but has to pretend he doesn't because she's blatant as fuck even before theyre having sex. She's posting stuff like "waking up with your brother's cum in you" and "my brother A and I are trying for babies" and he has to just avoid yelling, "NO WE/YOU ARE NOT"
Ashley's blog is half her fantasies half real stuff that they are doing she posts a lot about sleeping in the same bed as him and "Icky older brother who gropes you" and stuff like that but from time to time she will just go on this horny posting rampage about breeding and incest babies and Andrew has to remain silent the whole way through because he cannot give away the fact that he's stalking his little sister's porn blog
Also side thought but Andrew's blog would be filled with arguments on why English class is necessary and darker fiction is good for society