They're not in an open relationship, he confessed to the kouhai because he thought that he liked the uke, but then the misunderstand was cleared and nothing happened between the seme and the kouhai because they have nothing to do with each other, they're not in any kind of relationship other than co-workers
He confessed to drift away the kouhai from his lover because he thought the uke was liked by the kouhai
Kouhai is deeply in love with Oazki...but besides fucking with Tsu-kun's mind he won't cross the line because he is a good guy and Ozaki is happy.
I don’t understand this manga a bit like are they on an open relationship l??? because if they are fuck this shit just stay together already why the fu fu fuck he would confess to his kouhai and kiss him???just say I love my blond so fuck off