Taking an ace out on a date and still treating them all the ways someone would in that setting but there’s no expectations afterwards. Holding the door open for them. Telling them how lovely they look that evening. Using your hands to help guide them through the crowd. Going to a second spot afterwards just to keep being able to laugh and talk to them. Those types of experiences should still be able to happen even when it’s platonic.
There’s not enough love for demisexuals out there. Your sexual orientation is so valid. You’re not withholding, or picky - your connection to your partner is most important above all else. It’s all about trust. Never let someone tell you otherwise.