For maximum "That's really a bull fucking me!" realism, figure out some way to keep it upright, then climb a ladder above it, and drop from about 8 feet onto it.
You won't be able to tell it from the real thing. Well, OK, you won't have his weight on you, but the penetration and impact part will be close enough that the difference will be difficult to notice. Or were you not aware that your fantasy lover is the near-perfect archetype of the classic "one-pump-chump" - A typical breeding goes "follow the cow around until she stands still long enough to mount, jump on, hunt for the hole - some of them seem to consider that part optional, and proceed directly to the next phase - slam the full length in, often with enough force to lift both participants off the ground (or cause her to face-plant - or both) in a single thrust, drop off, light a smoke and ask "Was it as good for you as it was for me?""