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I don't think Tendou planned any of it. I think he went to see Kazuomi to convince him to stay in the club, and then one thing led to another. I don't even think that he's really thinking when he first takes off Kazuomi's collar. Sort of a mix of his own alpha instincts to bite, plus the disire to keep Kadota and Kazuomi apart (but without any real thought). Then Kadota walks in and change of scenario once more.
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Tendou raped Kazuomi. He was selfish. Let's call it what it was, he's been using Kazuomi all this time. And now he's used it again so he can form a r/s with Kadota without both Kazuomi and Kadota's permission. What's the point of pretty words if you don't respect the person? It doesn't matter if it was just going with the flow or if it was intended. He raped Kazuomi, bit into him without permission. Pretty words doesn't stop him from being manipulative, an asshole and a rapist.
But here I am, hating on fate. It's rare for an alpha to love another alpha. Tendou was srl in love with Kadota. I feel for him and that sad look as your love walk away with someone else. I understand how Kazuomi would feel, he's really kind, and soft hearted, always put others before himself.. Sigh..
I can't really say that Tendou is an asshole, since he did tell Kazuomi to think of himself more because he's just another human.
But the last chapter tho, I wondered if that was calculated, or because the flow was going that way so it kinda happened that Tendou also bit Kazuomi. Idk about tug that, and would never find out too T T