Night Patrol Se...Yeah, the title didn't even need to be completed for us to know what it's trying to tell us.
He's a nice guy, definitely, but...I think he's actually in more danger than she ever will be in the streets at night...After all, someone might lead him down an alley and...Oh wait, that's exactly what happened.
Great ending though. Ah yes, and thus he has shown her the proper way, away from whoring herself out and into a wholesome relationship.
Was 'converting a schoolgirl prostitute into your girlfriend' worth the gut punch at the start of the story (even if it's implied she was so "satisfied" by your efforts that she's willingly giving up her 'side job')?