Old school Puss?????

Im messing wit this older woman and and when we have her is always dry no matter what we use her l area is always dry.... you wouldnt believe how good the head is with her dentures out. so since she gets me off its only right that i do that same... but i cant do that when her l area stays dry. i want to try some crisco oil but i dont think that is a good idea...any ideas would be helpful..... this for real