For me, the idea of sharing a bed with a grown opposite sex sibling is, as someone said, 'eeeww'
Everyone's got different relationships with their siblings though. I'd kip on the floor rather than share a bed with my sister.
justme - I think it's lovebombing if there are declarations of affection which make you feel uncomfortable.
It's different for everyone, we all have different levels of engagement, which may be different with different people. It's whatever makes you comfortable. If you don't feel comfortable, don't feel you have to put up with it.
But it's not really our place to say what should or shouldn't make you feel comfortable, that's for you to decide. Lots of text contact after 2 dates and a month of messaging sounds fine to me, I'd prefer that. Others wouldn't.
And I don't think 4'11 is too short, personally. It's quite short, but less than a foot shorter than me.
Maybe more than a foot difference is too much, but even then, some very tall men will like very short women. It's personal choice.