I felt bad for Tsukasa throughout the whole thing, and there were points where i just felt like crying, but the end, that made me cry. I feel so bad for Tsukasa. Seeing the history of the two of them and learning that Tsukasa's omega complex is because of Yoshiki is sad. You learn that Yoshiki has always liked Tsukasa to the point of obsession. And that last panel, when you see him poking a hole in the condom, my god, the betrayal.
If it wasn't for the ending i would re-read this.
Imitation Mate