That thought did occur to me, but I don't think the seme actually viewed the uke as a possession. He did call him a "toy," but then he also said it was just a game, so he was a toy that was always meant to be throw away. You could be right though, as I feel not enough has been explained about the seme. I think once we know why he did all this we can more understand his feelings and how they've changed towards the uke
Well his game was to seduce people almost rape them and once they are attached to you completely madly in love with you then to threw them. I don’t feel sorry for kou
I can understand why some people hate the seme, but I can't bring myself to do the same. I'm kinda hoping that in the next couple updates, they'll give him a back story as to why he would do this to the uke (though whatever happened to him is no excuse.) I'm just happy with all the choices the mangaka has made, whether it's succeeding at making their love appear mutual even if it was actually one-sided, or having the uke leave the seme rather than doing something reckless or going to the seme and begging to be taken back. And I especially like that we see the seme suffering, not just realizing that he was in love and feeling regret, but the overworking, weight loss, and paleness, exactly as the uke did. I have high hopes for the ending, even if the seme doesn't deserve the uke at all.