Look, she is your sister. Talk to her. If you tell her how deeply you feel, she might take the kitten instead. It's not like she won't see Jupiter again ?

As my mum says to me 'If you don't ask, you don't get' The worst result is your sister wanting Jupiter back.(i.e. where you are now.)

I do believe in fate. Things will work out for the best whatever happens. Thinking of you.