In the confines of their closet sanctuary, Touma and Index's breathing grows heavy, their hearts pounding in sync. Index's tiny hands, once used for casting spells, now tentatively explore her brother's forbidden territory, her innocent touch sending jolts of pleasure through him. Touma, his cock straining against his pants, can't help but imagine his sister's tight, untouched pussy enveloping him, their taboo lust consuming them as they succumb to the carnal desires that have long been suppressed by their religious upbringing.