Remember Starks Are Made of Iron

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Remember Starks Are Made of Iron
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Summary
When one door closes another opens, but what if it’s the same door opening and closing from the very beginning? When Howard yelled at Tony to take his first drink Antonella decided it was enough. Antonella Maria Stark didn’t know how to be an older sibling, and as Sebastian Magnus Black he only had an older sister. But if it meant Anthony’s safety she would bring the world to its knees. After all the Black’s were ruthless when it came to protecting what was theirs. It was time everyone learned Starks were bred of Iron. (Tony has a twin. Self-Insert)
Note
Disclaimer: Own nothing but the plot, and my OC. :P

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