She is 25. I have explained to her lots of times what is happening what will happen the feelings she will experience, if she feels like she needs to pee it isnt pee (as long as shes peed before hand) etc but when she is getting close when I go down on her she pushes me away or moves away or traps my head between her knees whatever to make the feeling stop. She says she can't help it and suggested I tie her up to stop her moving. Is this really the best way to get past it? Is it normal? Is it really that hard for herself to cope with mind over matter to go 'over the top' ? If I tie her up and go down on her how do I know I need to keep going if she tells me to stop but its just caused by nerves? She says when she rubs her clit alot she chaffs and has to stop which makes the feeling go away. I asked her why doesn't she just use lube or rub it in a different way or place but she just ignored me. She confuses me, is she embarrased or simply not know what to do or genuinely scared?