Yukito, being the ambitious fucker he is, applies to be a domestic servant at a mansion. The landlady tells him he can only get the job if he masturbates in front of her. He gets the job.
Yayoi is a sexually frustrated housewife with a workaholic husband who hasn't been paying her enough attention. She decides to use her sex toys, but it just isn't the same. She needs a real cockmeat sandwich. And she needs it now.