"Encounter in Kellen County" by Fred Clarke (THC repost). The boy's family has moved to a remote Amish community, and he figures he's in for some dry days. But then he meets Sarah, a liberal girl who doesn't subscribe to quite all the Amish customs. They have some great times together before he goes away to college. I know I have promised to defend nuns and the Amish in my reviews, but this girl seems healthy and requires no defense. It was a sexy story.