Ok. So, MC is either in a xianxia/xuanhuan/wuxia world. I think he has a rock with a ferret master inside. MC learns some fingering and handing moves. MC's fingering and handing moves are pretty op. Last time I checked, MC was in some sort of area fighting with the top of his clan(?). Something like... one finger death? I don't remember.
Are you sure you arent mistaken xianxia for r-18 novel? fingering ability should handy for that damn i got baited but got good laugh.