Katsuki's had a partner since the end of middle school. he wasn't exactly hiding it, he just didn't see the point in flaunting it to these extras. That being said, he liked the secrecy, it kept him from worrying about what they might be saying behind his back. so he wasn't planning on letting out his little secret for a while. But fate likes to taunt him, forever going against his wishes. It wasn't his fault this time though, it was his partner's. [not marked Mature but contains foul language]