It's a bit of a fetish of mine. Spread the wealth of pictures. /d/udes
because you know how good it feels to cum with a dick, hence why you can imagine how good it feels for the futa + she has the body of a female which turns you on anyway - and that is most likely why you have that fetish, or you just like dicks o.o
the ones we most often see in hentai are so called 1st-generation onaholes that went out of production a number of years ago.
currently almost all onaholes are close ended and opaque, close ended for suction and opaque for appearance reasons, you could try and find a sort of clear one and slice the end off of it, but you're not gonna find any clear, double ended holes anymore.