How do I cum in a cage?

Hey! Im still pretty new to being caged and I’m really loving it, it’s what feels most natural to me. One thing I’ve noticed though is that I’m not able to cum while I wear the cage, I’ll finger myself or use a dildo to try and cum because I don’t like jerking, but I can’t actually cum without taking the cage off and jerking. Do you know how to help with this? Or are faggots not supposed to cum? Thank you!