Raped in front of my husband's eyes - a house-eating insect

Ikushima, an exterminator, aims to the married woman he is requesting, Maki, as a sex outlet. Ikushima sprays a drug that makes him sleepy and invades the house, but Maki is seen and is frustrated. While looking for her underwear while her sleeping husband was still in the middle of her, she ran into Maki when she got home...