Gag reflex👅

So I have a really bad Gag reflex due to a bad past but I love being able to satisfy my SO and I love doing it with him but I just can't stop gagging. Does anybody have any tips or ideas on what could help me or how I can still satisfy him with my mouth without gagging??? Please help, I'm desperate. Him and I have been together for 3 years and I really want to surprise him for our anniversary with a treat👅 No hate comments please