Yes

it's right after season 3 as the rabbits from watership down finally have peace.
Rosemary is my new character for watership down and when pipkin first met her, he fell in love with her. She came from a warren not too far from efrafa as the other rabbits helped her get to watership down as her warren was destroyed.
So to make it short, pipkin met her and showed her around and fell in love with her as he got to know her.
