Step Mother problems

Lyndie

I'm a step-mother and my step son wants to call me mommy. His mom gets him every other weekend, so she is present but I take him to school every day and put him in bed every night. I would never want my own child (hopefully I conceive soon) to call another woman mom, but I am his mother figure, so I cant blame him. I was thinking he could come up with a cool name for me? He wants to call me Momma 🙄