Okay, so sometimes people can be born as twins, which means they come out of their mommy's tummy at the same time. Just like any other brothers or sisters, they have a special bond and often spend a lot of time together.
Sometimes, as the twins grow up, they might start to have special feelings for each other that brothers and sisters don't usually have. This can happen because they are so close and have such a strong bond.
But it's not okay for twins (or any siblings) to have a romantic relationship or have babies together because it could be dangerous for the babies. It's important for people to find love and companionship with someone who isn't related to them.
So even though twins might love each other very much, they shouldn't do anything that could hurt themselves or potential future children. It's best for them to stay close as siblings and find other people to be romantic with.