My stepson asked me to adopt him in custody court

My husband has been going through a custody battle with his ex wife for a few years. He's been in our emergency custody for 6 years. I'm really not gonna tell his business because it doesn't matter but he started calling me mom a year after living with us and I honestly think that's the only reason she tried to fight for custody of him again because she was hurt. In court today they let him speak. He's 16 and at first didn't really want to say anything during these battles because it stresses him out but he said he wants to stay with his dad and in fact he would like his Diane (he called his mom by her first name) rights to be terminated because he wants his mom to adopt him and looked at me. I could not believe he said that. I just looked at him with tears in my eyes and was like "Rarely?" And he said "Yes." Diane was not happy. We should have one final hearing next month but I hugged that boy so tight and said depending on how this goes i may or may not be able to adopt him but i love him and we can always do an adults adoption when he turns 18. This was a hard emotional day.