People feed multiples all the time. I've done it a few times when the only mice available to me were too small. Nothing wrong with it. Just shoot for 10-15% of your BPs total weight. Feed like normal, and when it finishes the first one offer the next. Some people say they "start" the next one in the BPs mouth while the first is just finishing going down, and reflexes take over and keep swallowing. I don't like this method because it doesn't allow the BP to refuse if it doesn't want another.