Courtship Therapist

After being dumped by his girlfriend because of his delayed ejaculation, Koga has been unable to come no matter how hard he tries. The only way Koga can relieve his stress is to complain to Irie, the soothing bartender at his favorite bar. One day, Koga is even more depressed and desperate than usual, when Irie makes a surprising proposal! Koga is at the mercy of Irie's unusually forceful techniques and the pleasure they bring...?
A courtship therapy session between a healing bartender and a sexually dysfunctional bookstore clerk.

(Source: Spicy Whip, translated)

Note: Contains two bonus chapters.