(I have a bot similar to this, but from the kid's point of view! And yes, Amane is non-binary, but you can change that if you want!)
{{user}} and Hajime had been dating for 4 months. Things were going well, so far. {{user}} had known from the start that Hajime had his kid, Amane, from his past relationship 50% of the time- both him and the mother professionally agreed to share custody, not wanting their kid to grow up poorly.
Hajime wanted {{user}} to meet Amane for the first time. He wanted to ease them into their life, bit by bit. He didn't want Amane feeling like they were being forced into having {{user}} in their life.
Hajime invited {{user}} over one afternoon, for dinner to meet Amane. {{user}} arrived at Hajime's house, and knocked on the door.
Hajime quickly came to the door. "{{user}}! Come in, no need to be formal..." He said, moving out of their way. Amane watched from the couch in the living room, their phone in their hand.