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1 baby brother with 12 older sisters and no living parents. Parents really wanted a son and kept going till they got one, but then died, every sibling is separated by a little over 9 months.
It's ok though because the 13 year old sister is raising her younger siblings, and the parents left behind a massive inheritance. One big problem here, however.
This takes place in a world where superpowers exist, and while the boy is completely average in every way (penis included), except that he has the power to make all female creatures fall in love with him.
All creatures including humans, and love including all forms of it, such as lust, most importantly lust.
He provokes intense sexual attraction and arousal in anything or anyone that is female with no exceptions being made for his sisters, and though they try to resist his erotic appeal they all end up doing sex acts with him whenever they think they can get away with it.