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i saw a thread talking about this before and as i understand it's an illustration. i know a manga that had main characters a bit similar to them tho? if you're interested
i will gladly read it!
it's because they kind of look like these pairs. the covers may be different but there's some similarity
http://www.mangago.me/read-manga/pet_wo_kaimashou/
http://www.mangago.me/read-manga/tsuyameku_hishatai/
Or you can just ask the group, they're still very active in the BL community - http://fujoshibitches.tumblr.com/. They will answer asks and they're still very active in the community, or do people just kind of ignore the writing on credit pages?
for years and years, i have seen this pic and wanted to know what manga is it from?!
http://www.mangago.me/read-manga/amakute_tsumetai/sa/v01/c005/pg-2/