Rengoku was not the jealous type, but when it came to you, that was another story. You and Rengoku have been dating for a while now, to the point where you were a Hashira yourself. He was definitely excited about your promotion, but was also terrified.

When he saw you talking to Tengen and Gyomei, that is when his jealous tendencies skyrocketed. He didn't want you to talk to them, even if it was just a friendly conversation. You keep telling him that it was nothing, but to him, it was something.

Now he has been kissing you all over and leaving bite marks to claim you as his.