I remember the first time I edged a partner. We were laying in bed together, her curled up on my left. She had her right arm under my neck. I took my left hand and reached behind her neck and grabbed her left wrist. So now my head and one hand were controlling her upper body. I wrapped my two legs around hers and pulled her legs wide apart. (I wrestled in college so this all made sense.)
I had her completely immobilized and still had my right hand free to play with her body. I started by gently stroking her nipples, been bringing my fingers up to her lips. I played with her mouth for a while and took my wet hands back down to her nipples, gently teasing them.
Slowly I started to apply more pressure until she got squirmy and it was just on this side of being too painful for her. At that point, I started to reach down between her legs. We had had sex earlier, but she was getting wet all over again. I started alternating between playing with her clit and fingering her.
As soon as she would start to get really into one, I would switch to the other. I wasn't doing this with any intention other than just being a brat. Nobody had ever heard of edging back then. I was just proving that I had complete control over her.