What choice did she have but to get so close when he keeps sticking to his phone only to watch the AVs, even when they are watching together? In this case, Emi actually benefitted from it since it did give her the chance. Being a hardcore porn aficionado, you'd think the dude would be interested in real sex as well. This is fiction, so who knows. Emi is still too innocent to really push it, nonetheless, especially when Tatsurou wouldn't meet her halfway.