while her description has him fisting her with Gunslinger. I think fisting her with a Gunslinger would have a very strong chance of killing her with air embolism. Her description only mentioned using fingers inside her, which can simply mean sliding them in to stroke the G-spot area, and didn't specify which set were used when making her faint. My assumption after reading that paragraph was that he simply didn't stop after she reached orgasm and the intensity afterwards was too much when he kept going, trying to get her to reach multiple orgasms, though maybe that's merely an inexperienced and stupid guess on my part.