Umm I want to help you somehow if you could be more specific with the characters or plot details? Or if not me there is someone who surely knows just give more details.
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Try this for multi genre/tag search: https://www.anime-planet.com/manga/all?to_chapters=12&include_tags=304,604
Also try this for specific tag: http://www.mangago.zone/tag/2%20stories/
I really don't remember much about the 1st 1 but the second 1 has a character looks like a girl a bit and he is obsessed with muscles and another character that has black hair that cover his eyes and the cover is of the first story
This maybe ╮(￣▽￣)╭
http://www.mangago.zone/read-manga/karada_meate_de_warui_ka/
Also, Sakira does a lot of muscle men bottoms with shaggy hair over the eyes and smaller tops. http://www.mangago.zone/r/l_search/?name=SAKIRA
Do any of yall know the name of this manga:
2 stories, the second one is smaller than the firston, there are less than 12ch.,the second story is about 2-4ch. (●'◡'●)ﾉ