Is it possible to interrupt erections?

[cunnilingus]

As I have said before...when I want to enjoy shemales I always look for the small-cocked ones but not tricky small cocked ones...I'm talking about the real ones....but it's really hard to find real small-cocked shemales (not exactly with micropenis but something very similar) so... I was thinking that may be if they don't have erections their dick would always be in the size I almost want....and that would be great... I have been with "tricky small-cocked shemales" and when they get hard they stop being small cocked ones because their dicks get really big then my excitement ends and I use to get frustrated because they were not what I expected.

Is it possible to stop or interrupt erections? not permanently just for awhile like any legal medicine (obviously...they have to be agree)or any method or something....it has to exist something...
thanks.