Looking for 1

Hello guys, I'm looking for a manga.

I remember the mcs are twins. The setting is they are male, and they don't go to the same school. Then one time one of them (let's say A) for whatever reasons (maybe found a crush) begged his brother to let them switch school for a few days/weeks. B agreed to it but didn't really liked the idea. And A didn't tell him his (A's) relationships from his school, so when A's best friend mistakes B to A and makes a joke, B actually believes him (it was about "aren't we dating? Why didn't you kiss me?" So B kissed A's best friend). BF then knew something was up but didn't say a thing.

From the plot I only remember the aspect that A had trauma/fear of water, and B had from fire. And B got into a burning house and froze bc of the fear and BF came to rescue him bc somehow he knew he wasn't good with fire.

I read it a decade ago almost, so I'm not sure any of you knows it, but I would really appreciate it if any of you could find it for me. I really wanted to read it but was postponing it till I completelly forgot the name...