First time I shared my FWB was with a friend she thought was cute. Our first encounter she got excited about his bigger cock but tried to hide it. I was in her and we were going at it, rolled over and she grabbed him and he started fucking her. The immediate audible responses changed and soon she was cumming.
I knew then my abilities were limited to going down and getting them close and then fucking them while they cum. He just fucked her through several orgasms, staying in control and talking to her as she came. He was only 19 at the time. He just had it, a nice big cock and the confidence to make ladies cum over and over.