Yes pumping does have permanent effects though it is less effective than topical androgen creams. It does help to develop the tissues mainly by increased blood flow. Therefore you will have more blood in the area carrying not jusy androgens to the site but oxygen and nourishment needed for tissue formation.
Test the pump on your leg first to learn the controls so you don't have a mishap where you can't find the pressure release. Then never pump enough to hurt. minor discomort is fine but pain means tissue damage so slowly increase pressure and note how much is good and how much is too much. Leaving the pump on more rather than less is better but just like a muscle, developing tissue heals during rest time. If you're as busy as me shooting for 2x a day will yield about two on days off work and some days nothing which is good that is when you will heal.
Size Matters 'clit' pump on Amazon is what you are looking for. 'Male' version is too large so they're basically using the other word in place of smaller anatomy version. The cheaper models on sex toy sites are junk and won't do what you're looking for. Anything cute and gimmicky is just that.
Happy pumping! Let me know if you have any more questions
