Besides that, my breasts are sometimes sore and tender. There are several points that you may wish to consider. If breast play has never been something that you have enjoyed, it is unlikely that you will enjoy it now. If, on the other hand, you have always liked that, and you found it to be pleasurable, then there is no reason now to give that up. Your husband will not be able to deplete your milk, nor is there any risk of any harm coming to your baby from this activity.
Couples also use it as a way to comfort or bond with each other after the birth of a baby.
Since no harm will come to any of you from this activity, it just comes down to whether or not you want to do it. If you're neutral, you may decide to give it a try. If you like it, fine, then keep on. If not, then don't do it again. If you think you would like to do the activity, then go ahead and enjoy.