Just your typical brainless Isekai BL, with the seme being a brainless tsundere and the uke falling for it regardless of the rudeness.
Why the seme is rude? First, he misjudged the mc (but the author seems to find this funny). He says the mc is some kinda flirty omega or something. Heh, this ain't a big deal in BL? Sure, if you're reading toxic BLs, I'm sure this catcalling isn't the worst.
After that he didn't even apologize, continues being a tsundere. Honestly, being a tsundere isn't even an excuse to being rude and disrespectful. It's just being plain stupid and narcissistic.
Then he didn't even consult with the uke, right on giving him this collar with his family emblem like the uke is some kind of an "object" belonging to him after putting it on? Like where's logic, common sense and basic human decency? He knows it's wrong to have premarital sex but doesn't know how to get his partner's consent about such things?
He literally just dragged the uke and announce he's gonna marry him Infront of his parents in a Grand ball! Now, this sounds romantic for brainless readers. But can't you guys see what's wrong? The uke have zero idea the fuck is going on.
Speaking of, what makes this unbearable is the uke himself, how could he fall for a rude, narcissistic bastard? Are you the mc in a Wattpad series? Aren't you supposed to be straight?
In short, this is pure stupid that only brainless readers would enjoy.
I find it ridiculous how most bls find this kind of trope sweet and romantic--What did I expect from a bl manga anyways...This is why danmei novels are much better.
Omega ni Dake wa Naritakunai!! ~Isekai Tensei Shitara Ane no BL Manga no Nakadeshita~