Jack and Ianto Daughter Buffy Challenge
Jack implies that he could get pregnant. So what if he was during 'The Year That Never Was' with Ianto but The Master killed their little girl and Ianto. The Jack doesn't remember their daughter, so the Powers That Be take her and place her with the Summers in 1981.
When Buffy jumps into the portal the PTB decides to place her back to her real parents as her reward. So she was spit out of the portal aka The Raft in the middle of Torchwood, in Cardiff, in Wales, in the year 2008. As a 5 year old!
Buffy has her 20 year old memories but starts to act like a 5 year old.
Buffy still has slayer powers
Buffy liking Ianto.
Buffy bored and getting into trouble.
Must be after the episode 'The Year That Never Was' in Torchwood
Buffy mistaking Captain John Hart for Spike.
Buffy playing matchmaking
Not liking Gwen.
Owen taking a blood sample from Buffy and discovers something about her DNA involving her parentage. This needs to happen near the beginning so they now she is their daughter.
Buffy meets the doctor