Best Drug for Inserting (large) Foiegn Objects Into the Anus?

[Benjamin Bones]

When the urge to stretch the sphincter muscles around a prizewinning marrow overwhelmes SWIY what, if any, chemical aids does SWIY employ in order to facilitate maximum rectal elasticity?

The onanistic urang-utan and the avidly homosexual chimpanzee of SWIM's acquaintance are tiring of amyl nitrate, indeed, the whole (hole, geddit?) back door lovin' scene is becoming more than a little bit jaded for them and are hoping that SWIY could turn them onto something that could put the va-va-voom back into their shit-chute shennanigans.