TMI (Fingering and crying??)

Just gonna be straight forward, every time my boyfriend fingers me, my eyes become teary. I don’t feel sad or anything negative at all, but I always find myself tearing up a lot. And (kinda more tmi) when he’s especially going rough, that’s when I legitimately start crying. It doesn’t hurt at all, if anything it feels amazing, and I don’t feel guilty or anything but why do I always cry?(I don’t cry after getting fingered, it’s during it.)