wait lmfaoo im so curious too now. surely u can ask the author of the post? idk sorry i couldn't find it either :(
No worries ^^ I think the only way I could have an answer is for someone who read the manga to stumble upon this post or something, 'cause you'd have a better chance at finding a needle in a haystack than finding the title to the manga on your own.
Someone else did ask the writer what the name was, but unfortunately they never received a response. And most of the time I don't really see them responding to these kinds of questions, so I knew there was no point in me asking as well.
It's been three days now, so the chances for the writer providing some kind of answer are probably slim to none（´∇｀''）
I might be dumb even asking this from y'all 'cause people aren't detectives on here tf am I even thinking?
…But I'm getting really desperate.
So boom, I was browsing through Tumblr on a smut tag like the typical gooner I am, and I found this fic with this absolutely delectable header.
Here is the link to the fic I'm talking about and the header:
BE WARNED THE PIC IS VERY SUGGESTIVE SO IF ANYONE IS UNCOMFORTABLE WITH THAT PLEASE DO NOT CLICK THE LINK https://www.tumblr.com/kkunai/807664727702519808/hold-me-tight-jjk-men-%F0%9D%90%92%F0%9D%90%98%F0%9D%90%8D%F0%9D%90%8E%F0%9D%90%8F%F0%9D%90%92%F0%9D%90%88%F0%9D%90%92-%F0%93%82%83-%F0%9D%9C%97-what?source=share
And idk why Tumblr writers do this, but when they put a header from a hentai in their work, they don't state the name, which is like, why the fuck would you not do that? But anyways.
I've tried to find the origin of that pic EVERYWHERE, but I've come up severely empty-handed.
If anyone recognizes the pic or can recommend me a site that could help me or something, please be my guest.
As to why I asked this question on here instead of anywhere else, it is because this is pretty much the only site that I feel comfortable asking questions and being active on, so please excuse me if anyone feels like I had unreasonable expectations. After all, we don't know all mangas just because we read them.