Sentence:  I suppose the reason so many <WSD>Snapefic</WSD> writers pair him up with Hermione is that she's really the only choice unless you're going to introduce an original character. In the long run, I don't see the age difference being a problem because of how long wizards live. In the short run, yeah, I could see Snape getting frustrated rather often with being the only adult in the relationship. 
Meaning of the word marked with <WSD> tags:  Such fan fiction collectively.