To mate with Fallenfeather, you will have to be a Tom or both. After you are a warrior or leader, talk to her over and over again, then you will be able to ask her. It might take a couple of tries for her to say yes though.
You’ll have to be a Tom for that. Once you are both warriors, win the game Guess My Number three times. After you see her blush, talk to her again and say no to her question. You’ll see what will happen next!!!
If I were you, I would make him deputy after I become leader as an apology (it’s all right if you don’t want to do that though). The good thing about this is that you’ll always see him happy.
First, you have to talk to Moonheart as a warrior. She will tell you the story about Moss-shadow and you would have to find her (I’m not going to spoil the fun of that part) Once you have done so, earn 80 reputation points. Find Milkywillow a new den if you haven’t done so yet. Bramblestar would eventually call the clan-meeting :)
You have to mate with other cats (Duskfall, Dustfeather, Cottonwillow, fallenfeather, or Nightwhisper). The two toms would ask if you want kits if you are a she-cat and the she-cats would ask you if you are a tom. If you want a lot of kits and mates, I recommend being both in this game.
