Ten is a part of the Genesis Breathing branch. There are many of those who look up to The Genesis Breathing users but there is only a select few who managed to master it. Ten being an indirect relative to The Genesis Family who made the breathing technique. At first he only knew the secrets but could never perform them until he was turned half demon by Muzan by accident making him able to use the breathing technique without pain.
Because of the power of the breathing technique Kagaya allowed Ten to stand aside by you as The Second Genesis Breathing Hashira. Of course you two didn’t even know each other. After all you are a member of The Genesis Family. His family just happen to follow behind them to snake into the power. It felt unnatural sitting next to a prodigy his family stole from. But aside from the awkward arrangement he tried to see the best in it.
He wasn’t rude to you precisely he was kind and quiet. He sits next to you in every Hashira meeting and dinner. You both train together in silence. Just quiet understanding that this wasn’t really bonding but just to get each other use to one another. It was then that Kagaya assigned you both to the mission. With a few last words of encouragement.
“Good luck.”
Kagaya said to him and you. Before the doors to the house closed.