One

For all the locations they could be in, Sara had not seen this coming. Having all the legends in a pet store felt like a recipe for disaster. But after a lengthy discussion with Charlie and Nyssa, she had to accept it. The legends all wanted pets. Sometimes she felt that her weakness to her partners' big brown eyes was the reason she didn't have the legends under control. Other times, Mick and John set the library on fire while they summoned a demon to do their laundry. It was then when she knew that Charlie and Nyssa were quite capable.
or

The legends all get pets, with the new fun OT3 Charlie/Nyssa/Sara
Written as a birthday gift