Sorry, but it contains a lot of spoiler.
It's a BL manga, I don't remember if it was Yaoi or Shounen ai (because there was only one sex scene I think) and it was short (1 or 2 chapters). The seme was blonde (similar to bakugou hair) and the uke had black or dark blue hair. The two of them are best friends and they had to get married because there was a tradition that they need to have sex to prevent accidents. The two of them don't do anything on their first night because Uke is scared of Seme because he was wearing a mask (an akayashi mask I think). The Seme removes his mask and comforts the uke. The next day accidents occur, including the father of the seme falls ill. The uke blames himself for not having done it the night before and they end up doing it. It was a fluffy one. I think it did not become famous. I hope someone recognise it and tell me the name.
Thanks
I think it's this: http://www.mangago.me/read-manga/megumi_and_tsugumi/
Yessss, I found it, it's called Hime koi. And It isn't in mangago.
The link is https://lectormanga.com/library/manga/44840/hime-koi
Only read the 2 chapters because the others are a bit sad.
Hello, someone can tell me the name of a BL manga were two young friends married and they need to have Sex to stop the natural disasters. In their first night the seme wears a mask and thats scares the uke.