I want you to tie me down, blindfolded me then...
1) put different things on my hole. Such as hot wax, glue, Sriracha, rubbing alcohol, whiskey, icey hot, finger nail polish, white out, etc.
2) spank it with a paddle or whip
3) shock it with tens unit (estim), dog shock collar, and_or a stun gun
4) if you have an idea and I say yes now then no safe word stops it from being done.
The only limits is no and no Emergency Room Visits.