1) Do Kegel exercises before fap, while watching TV or something. Basically, flexing and slowly releasing pee muscles and taint muscles without flexing anus or anything else
https://www.webmd.com/urinary-incontinence-oab/kegel-exercises-treating-male-urinary-incontinence2) After 30 or as long as you can do that, try edging for a while. Kegels help you get better at edging.