He gives me love bites

Summary

Tsuba, a secretary, is told by his colleague Tsujioka that his nail-biting habit is a sign of sexual frustration. One day, Tsuba is sexually harassed by the president of a client company, and Tsujioka sees him biting his nails in a state of agitation. What's more, he tells him, "If you're going to bite someone, bite me," forcing him to bite his finger, which arouses his sexual excitement...!?