Cuckold squirt game

So i've been trying to make my bbw wife squirt for quite sometime. She's done it before and says its her favorite thing, thing is that guys cock was huge. I've watched videos and read about how to even accomplish this with my hands. We recently made a deal that I would let her fuck other men until someone made her squirt, but only if I was there. I asked her to start with the guy that made her squirt the first time. Should be fun. Our first venture into cuckolding and its more of a game than it is anything.