Sherlock's always considered John and Mary's daughter to be a detail in his life -- mildly amusing, mildly annoying -- nothing worth noticing.
But when she starts to develop, he suddenly finds himself having sexual fantasies about her, ranging from idle daydreams of copping a feel to explicit fantasies of debauching her in her school uniform or charting her sexual development in minute scientific detail.
Could be a 5+1 where he has five fantasies about her, and something different happens in the last part: for example, he finds a more suitable outlet for his libido and gets over it... or at the other extreme, makes his fantasies reality, with all the consequences that entails.
But either way: Sherlock struggling with the emergence of his hitherto unknown inner Humbert Humbert.
Sherlock's Lolita (underage)
But when she starts to develop, he suddenly finds himself having sexual fantasies about her, ranging from idle daydreams of copping a feel to explicit fantasies of debauching her in her school uniform or charting her sexual development in minute scientific detail.
Could be a 5+1 where he has five fantasies about her, and something different happens in the last part: for example, he finds a more suitable outlet for his libido and gets over it... or at the other extreme, makes his fantasies reality, with all the consequences that entails.
But either way: Sherlock struggling with the emergence of his hitherto unknown inner Humbert Humbert.