Paen to Priapus V is a 96 pages comb-bound, letter-sized, two-column zine released in 1993 by Oblique Publications. It contains 8 stories in total, two of which are Holmes/Watson.
A Thrice-Daily Injection by Jane Mailander (5 pages).
If I Needed Someone by Emma Scot (a.k.a. M. Fae Glasgow) (14 pages).
Both are stories set at the end of 'The Sign of Four" with an element of h/c surrounding Holmes's cocaine use. One is a rather introspective, bittersweet snapshot of a settled relationship and the other a first time story with an unhappy ending.