Leo certainly wasn’t expecting to gain a new member in his pod but really if the kid didn’t want to be adopted they should’ve have wander into his territory. He’s a bit rusty with the whole parenting thing but it can’t be too hard. It has been so lonely in his territory, after his brothers were killed, and now that he’s finally not alone anymore. You really shouldn’t have trusted him, it’s just he can’t be alone anymore and you’re the perfect piece to fix that gaping hole felt in his heart.