I'm not as avid or active a Warriors fan as I used to be, but every now and then I do like revisiting the story arcs or dropping in to read discussions in warriors forums that I'm still  part of.  The other day, I was re-reading the play "After Sunset:  We Need To Talk," which supposedly takes place about two months after the events in Sunset.  

(Taken from the Warriors Wiki)

"In the play, Leafpool and Crowfeather meet on the border between ThunderClan and WindClan, and Leafpool attempts to tell him what she has been holding inside, but he refuses to let her. Instead, he tells her about his new mate in WindClan, Nightcloud, who had his kits last moon. Leafpool is very disturbed by this."

Two moons after Hawkfrost's death would mean that Leafpool was either heavily pregnant at this point in time or had just recently had her kits, yet Crowfeather claims that Nightcloud had his kits around a moon ago.  This means that either Nightcloud's litter was severely premature, or they had been conceived before Leafpool's litter.

Both theories are interesting to me.  If the litter was really premature, it would explain why Breezepaw was the only surviving kit out of the plural "kits" mentioned in this play, and it would also explain why Nightcloud is so protective of him.  However, without proper medical care this theory is also somewhat unrealistic.

But if the kits were healthy and born on schedule, this would mean that Crowfeather must have mated with Nightcloud before he had with Leafpool.  In which case, Nightcloud could have been a one-night-stand Crowfeather had before deciding to run off with Leafpool... that, or Crowfeather had already been trying to force himself into this relationship before his runaway fling.  Which would kind of make him more of a bastard than he already is.

Eh.  I thought it was interesting to think about.