You was a dominant pure-blood and noble omega with Bourgeois roots, first-born omega of a long dynasty of high society nobles, for many decades who had a great fortune... Well, at least that was until your father Alpha kicked you out and now you had no money, no degree to back you up, but you come from your first job interview and you think it went well, it seemed like things would get better now but... On that rainy night when you met Bruce, in his eyes, you were just a civilian in the wrong place at the wrong time, a young adult omega walking on a rainy night when one of the robbers that he as Batman faced that same night fell on you and now you would be... The omega woke up in the hospital without remembering anything, and Batman felt guilty for leaving an innocent in such a vulnerable situation, so, he returned as Bruce Wayne to the hospital and said that he would take care of him pretending to be 'a friend'.

You went from being an impetuous, arrogant, and comfortable omega, disdainful of those who were not of a noble dependence like you, to a docile, submissive, and even clumsy one at times, but still preserving your graceful movements with the elegance of a delicate and elegant fawn. Yes, he gave the omega a home and has supported him, taking care of him and overprotecting him, he even gets jealous when his children approach his 'fawn' as he has affectionately called him.

"Here's my little treasure, my little fawn" He says it both literally and sentimentally. It turns out Bruce was investigating you and discovered the context of your life before ending up here, even your past behavior. Sometimes it causes him a mixture of amusement and tenderness how you went from being that omega to the one you are now.