Inquiring about whether my teenage sister wants to have sex. Misaki Mana KTRA-496

My little sister's been so cute lately, it's impossible... The brother, who sees his sister as a sex object, desperately wants to have sex with her! After mischievously showing his teenage sister a erotic novel... wait? She seems excited for some reason. Could this be a good opportunity?! The brother's perverted remarks gradually make the sister display a more lewd side...