
That's sad if everytime they want to have sex, the uke throw up... Huhuhuhuhu so tragic...
Or that's just once?? Still don't know ╮( ̄▽ ̄)╭

Well I don't know if their O/B/A. Rule apply here, but they're pretty similar, but basic rule is that after a while the mark needs to be bitten again to strengthen their bond, so for a good while it will be sort whacked out, but over time, with the help that the main two have a deeper connection, the bite can become inactive or just a small tingle, nothing significant like vomiting or intense shaking.

What I get from their last talk is that he would not become sick if they do it during the no heat period.
So, if they want to have fun and are not looking for a baby, they would be alright.

OMG!!! I'm so lost with this manga..
The plot is so confusing...
And when I see final chapter, my my,,, I'm so damnfound... Hahahaha
┗( T﹏T )┛(⊙…⊙ )

It's like this: There are the twins, one is the prince, the one who is going to be emperor in the future, and the other acts like a shield to the prince.
Why the prince needs a shield though? Because there are others who don't want the prince to be crowned and they put curses on the prince, BUT the curses don't affect the prince because he's got his twin brother as a shield.
That said, the shield-brother one day met the blond-demon-guy, they fell in love but they didn't last, so shield-twin left demon-guy to protect him.
But now the ones who doesn't want prince-twin be crowned aren't attacking him directly, now they are attacing the shield-twin directly.
And with that they corrupted shield-twin, making him one with the darkness.
So, the final chapter was about blond-guy finally getting close enough to reach shield-twin and possibly bringing him to the light again.
That's a damn wild cliffhanger we've got here ; - ;
I'm so curious!!!!!!! Can't wait for next chapter