My twins are also my first babies, so yeah.
Having twins can be very different from a single baby. I'd never breastfed one baby before, whereas you have, so you won't be as lacking confidence in your ability to breastfeed, as I was.
I also didn't feel let-down, or generally get a tingly feeling. Something which people were quick to worry me about.
"Maybe you aren't producing milk, then.
"Oh, you are."
I had so many subtle "you can't breastfeed twins- you won't make enough milk" hints from various people, that recording poos and wees was very reassuring. It proved stuff must be going in. Every time I saw a midwife, HV, or community SCBU nurse, they would ask, searchingly, "are there plenty of pooey nappies and wet nappies?"
Showing my records of poos and wees shut them up reassured them.
The twins were a little bit premature and small, so they were too tired to wake up and ask for milk. They weren't strong enough to respond to being hungry, and of course, if they were allowed to sleep, they would have just got weaker, and slept more. A vicious circle.