Well first of all..do you want another Yorkie??? Breeding just for the sake of wanting to give a good freind a pup is an awful lot to put on a female yorkie IMHO. Yorkies have statistics to back up the fact that whelping problems are a fact and with that, you have the possiblitiy of loosing the bitch, forking out alot of $$$ for vet bills ,possibility of a cesarean section, and loosing pups in the process. If you both go into this educated on these facts, and still desire to breed, there are several books, websites and support here on Yt to help you through this. I would carefully weigh this situaion out and make an educated decision, not an emotional one.