I never thought of out connection like that,we have unconditional love for each other, but doubt we could date, tho we had something that approaches "dating" parameters.

On a family vacation, we spend 3weeks hand in glove, one the best times of my life. Hours on hours of roadtrip back sitting, sleeping together at hostels, and chatting due to no signal. We did EVERYTHING together, our hairs, skin care, eating, shopping, to dressing each other, and making jokes.

even mom said she had never seen us so close it looked fake and movie like.

And there's a genetic aversion to it, and social ostracizment, plus to my eyes she is still primary schooler.

Also have to add the fact that I left home when my sister was 9, and B4 my preteen years I wished to have siblings, some there might be a Freudian romantisation of what we missed at that age on both sides