http://www.mangago.zone/read-manga/kurakura_inma/
It's not coloured but it fits the bill ( ̄∇ ̄")
It was in a mostly realistic setting, and nobody but him could see his tail. I believe the guy I described was the uke, and I'm pretty sure he hadn't acknowledged himself as gay before the story started. I believe the first chapter was him waking up to find he had a tail and nobody else could see it, then going outside and freaking out because his tail started going into the pants of other men around him and arousing them but he couldn't react to it because no one else could see it so he would look crazy/pervy.
I did read it a while ago so I'm not sure that these details were accurate. I don't remember what the MC looked like apart from that they were fairly young looking.
Hmm it depends what you mean by 'like this'
If you mean stories with incubus' then maybe try these
http://www.mangago.zone/read-manga/chihira_kun_wa_maryoku_ga_tarinai/
http://www.mangago.zone/read-manga/hetakuso_inma_ja_dame_desu_ka/
http://www.mangago.zone/read-manga/baby_sugar_succubus/
http://www.mangago.zone/read-manga/inma_kun_wa_oshigoto_dekinai/
http://www.mangago.zone/read-manga/welcome_to_the_caf_of_love/?eWa6
Or you could try browsing the incubus tag → http://www.mangago.zone/tag/incubus/
A while back I started reading a story about a guy that suddenly grew a tail that moved around on it's own to make the men around him sexually aroused and interested in him. It was a colored webtoon I believe, and i think the reason that it grew was because he suddenly became a Male Succubus/Incubus.