Very... weird manga. (dirty talk, sex toys, cross dressing etc.)
Ch 1-3: couple A. Younger, dominant seme likes older uke who is addicted to sex, but never actually likes him back.
Ch 4-5: comedy? Practically skipped the whole thing.
Ch 6: couple A again, extras.
Fuuzokugurui Desu Ga Toshishita Danshi Ni Kokuraremashita