Stella and [name_f]Luna[/name_f] would be so beautiful and magical for sisters! Unless, you’re planning to have more that two kids and you don’t like any other celestial/space inspired names.
Briana Dejesus from Teen Mom named her daughters [name_u]Nova[/name_u] and [name_f]Stella[/name_f]. I think the names sound adorable together (Okay, okay, this is probably not the best example because [name_f]Briana[/name_f] also decided that her daughters should share the middle name [name_f]Star[/name_f] which makes [name_f]Stella[/name_f]’s name - [name_f]Star[/name_f] [name_f]Star[/name_f]. But otherwise, it would be an amazing choice).