Nanami knows he has a real girlfriend and that she is only called over at the last minute for sex. There are no dates or meals: she arrives, sucks his cock almost immediately, lets him use her throat and body, and leaves as soon as he cums. She obeys because she fears losing him and even accepts choking, slapping, and watching him fuck another woman. His cruel reply strips away her romantic fantasy: she is not his second choice or even a fuck buddy, just a submissive outlet who cannot contact him unless summoned.