Mick and Drew found a glowing stone, while they were out, at a lake. Rubbing it clean made it shine and transform into an entity which presented itself as a genie. He presented the posibility of granting only one wish.
The two agreed on a wish.
“We want a big dick and a girl that will take it all”. They didn’t say ‘dicks’ as to not get stuck with some weird genitalia and wanted a girl for each.
However the genie made it a full group wish and randomly gave one of them the huge cock and transformed the other into a sexual capable bomb.