Fics like this is the family (i found, i made)

Buck grinned as he led Christopher to the bus, where a harried looking woman with a clipboard took a glance at Chris before ticking off a box on her paperwork. Her attention then redirected to Buck. "Mr. Diaz? I don't think we've met. I'm Christopher's Art teacher." "Mrs. Conrad." Buck pointed at her knowingly. "I'm a fan. Your homework assignments are my favorite. Mostly because I can do them." She laughed. "Glad to hear it. But I didn't think we'd be seeing you. Chris mentioned his dad would be at work today." "Oh, that's—" "Daddy is working," Christopher informed her. "This is Buck. He's my other dad." Or, Christopher refers to Buck as his dad for the first time, and Buck has feelings.

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