Explain what it feels like when something gets stuck in

Right after moving into her new apartment, Hasumi causes a flood that even ruins the work tools of Hiiragi, the handsome novelist living downstairs. When she goes to apologize, Hiiragi suggests a very particular way for her to make it up to him: helping him with intimate “research” for his next sensual novel. And so begins a daring—and dangerously close—research arrangement between an attractive erotic-romance writer and his neighbor.