The issue that arose was the fact that the tags did not properly warn readers and there were no trigger warnings to be found. There would have been no issue had trigger warnings been used.
Oh, I am sorry. I didn't know that. I could see though that the group translating this is a bit aggressive, but I assume they would at least tag it appropriately given the way in which they scrutinize people that "didn't read the tags" or "knowing that has rape still read it". I honestly just dropped this manga. It's not worth it, there is a lot more out there.
Assumed*
Yaoi is fiction. These topics have been around since forever. If you have been reading yaoi since young and have read old school stuff like Haru Wo Daiteita, Zetzuai , Junjou Romantica, Sensitive Pornograph or even Gravitation, you"ll know that in yaoi not all couples that are formed are healthy or go through healthy pathways to get to a relationship. In fact, many yaois feed off of the twisted and dark narratives to prove a point. There are tags, if you don't wish to read something because it doesn't align with your morals, don't.