Make sure she is as turned on as she can be...like struggling literally to not have herself touched or squeezing thighs to get in them tries at replacing a hand or tongue til...your tongue gets there to help ensure she's legit with telling you its time she be split or quit as long as she's turned on, lubricated then she's going to be good to go...sloooow. follow her requests exactly.."ooooh wait stop" keep still as possible....it was frustrating for me that stop was met with a sudden quick pulling out of the guy. But even with his size being on the larger spectrum and me being definitely smaller than the usual blow up doll, once ad deep as we were going, few moments leaving him still and there to get used to -squeeze- moved upon by me so that I controlled during fear still being present and more comfortable trusting self not to not be able to avoid movements outside my control that takes me to a dark place where I never return from :)