i feel like the fact that you are pre-t has something to do with the loss of sensation. testosterone causes that part of your body to grow, so pumping while on t is like working with the growth. if you're not on t, those tissues are just sitting there, and pumping is pulling on them. the fact that you are getting those bits to the size of a grape is pretty impressive but worrying at the same time (if you're the size that i think most people with faab genitals are). i'd cut back a little.