Ok. Here's my question. Does anyone have any good roleplay ideas?

My friend and I are on a roleplay and here is what is going on. It is a alternit universe and the doctor doesn't know River Song but knows Melody Pond when she is born. River doesn't know the doctor either but instead is dating Jack Harkness, who is the same Jack we all know and love. The Doctor is dating Rose Tyler. The Master is River's cousin. The Doctor is confused. When Jack introduces River to the Doctor, he senses she is part time lord and is all like What? I was wondering if anyone has anything that could go along with that sort of story line.