Wow what a wonderful gift to give someone , I agree I think a counselor would be good to see, maybe there's other couples in your area or a support group that have done the same thing and could give you advice ? Or even talk to your sister I bet she has her own fears too x
The baby is gonna be yours an your girlfriend biologically? If your not sure now how you feel you shouldnt do it,its honorable an sweet but...maybe think about it more.
well think of it this way. even if u were to fall in love with the baby. shes ur sister. ull see the baby constantly! ull always know that he or she is urs. but ur sister is taking care of them. u can always have another baby.
I think that a counselor would be your best bet in this situation, to work through some of the feelings you're going to have throughout this process. I think it's a great thing you're doing, but I assume you're going to have constant contact with this baby, as it's for your sister and her husband, so not seeing the baby right after delivery won't help much, you'll still be seeing him/her in the future.