Firtst, congratulations on the birth of your babies and good for you for exclusively nursing twins. A good book is "Mothering Multiples". A cup or syringe can be an option. If they haven't already had formula I wouldn't suggest it as it can alter thier gut making them more prone to illness. Some babies as they get older will just wait for mom to get home to nurse. Make sure you tank them up before you leave. Maybe you could go somewhere close, come home and nurse them and then go back out. Also, try going out for lunch or a different time of the day than evening. Most babies want to nurse frequently in the evening. It sounds like your babies are still really young. It won't be long until they are less dependent on you. In the meantime, just take short outings. Or maybe you could set up a romantic dinner and movie at your house for you and your partner, have the sitter watch the boys in another room and only bring them to you to nurse. I know it seems like you will never get out, but you will. They are only little for such a short time.