I want to do toys for boys but...
Always start small and work your way up.......lots of lube. Prostate play should NEVER hurt, fullness yes, pressure yes, butt never any pain, it that happens STOP. If you cause a rip to the anus area you could be setting your client up for a nasty infection. Research is your friend here. To many seen to think just buying a strap on and shoving it in makes them a fetish provider and they can charge more.....Not true if you look at the few provider that truly excel at fetish play they are the ones that dont up sell for it as we adore doing it. Slurp
I have been a "test dummy" for a few girls in my time. I would suggest befriending someone who already performs this activity on a regular basis then join her for a doubles session. She can teach you on a regular of hers. I always had fun like this. If I was teaching someone new on my own, it was less fun.