Interesting

This is going to be messy. Addis sayin on his comment that he is not sure if the 3 will share alturistic tendencies but it's already clear. Yuusuke clearly don't want tsukasa to suffer when in heat so he chose Kuji do the job that suppose to be his (obviously he loves tsukasa) since he have ED, Tsukasa on the other hand is OK whatever Yuusuke wants to stay with him and Kuji even though he's not obviously imprinted with tsukasa is willing to take responsibility. All of them are selfless for the sake of others. Hoping that everyone ends happy because 3some relationship will always leave one broken hearted or alone in the end.