Should I hookup with my sister's boyfriend?

I have an elder sister whose boyfriend (28y/o, tall muscular built, copper blonde hair) has been flirting with me. I find him really attractive and would love to hookup with him since he is, like, a really desirable man. I am 22, should I hookup with him? please help.
No, don't hookup with him. Don't ruin your sister's relationship.
Vote A
hookup with him without letting your sister know.
Vote B
Ask him to breakup with your sister first.
Vote C
just tell your sister that you would like to hookup with her boyfriend and let her decide.
Vote D
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Should I hookup with my sister's boyfriend?
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