How to finish pushing an orgasm

So I think I’ve been getting right on the edge of an orgasm but never actually had one. I feel my hips and all tighten up and my back lifts off the floor but it gets all tight then goes away. He says I’m wetter afterwards and can tell something happened.(never been like the romance books of an orgasm{not sure if they are actually accurate}).

Side note he does really good with making me “grind” and rock my hips with him wanting more. He’s about average but thick and knows how to use it and his hands are a different story(you could definitely say firefighters know how to use their hands and hoses🙈🔥💦🥰).