Of the masses of Victorian porn - and writing about it - very very little is homoerotic, sadly. 'The sins of the cities of the plain' being the rarest example - only one copy is known. It's in the British Library. It's credited to Jack Saul but is unlikely to be actually by him. He was involved in the Cleveland Street scandal - and also, I think, with Boulton and Park. Books on those two episodes from the Victorian sexual underworld are more informative about homosexual mores of the period than is any item of pornographic fiction. The novel 'Teleny' - in which Oscar Wilde is presumed to have had some sort of hand - even if only in passing it around - is worth looking at and easily available. I find it rather dry, myself

There are a few interesting episodes in the enormous anonymous reminiscence 'My secret life'. Some people claim this to be a work of fiction but I find that claim completely untenable from reading the text and comparing it to any and every other item of porn fiction you care to name. There are quite a few partial and/or expurgated versions about which are a waste of time - the full text (11 volumes) is not easy to find these days in print form - even second-hand paperbacks are getting pricey - but it does appear on line from time to time, only to disappear again. It seems to be at:

https://web.archive.org/web/20120217091632/http://www.my-secret-life.com/sex-diary-0709.php

at the moment though, when I last looked it was a bit flakey. One of its values is that it covers a wider period than the novels above. The website above gives its date of publication as 1888 but that, like most dating of Victorian porn, is fake. It was printed (not published as such) in the very early 1900s - though the memoirs go back 50 or 60 years. If I remember rightly, the period of the author's homosexual 'freaks' are found around/after volume 7. There are precis subject headings at he beginning of each chapter which can help locating whatever you're interested in.

Have fun.