Gary and Jason are two friends who always visit Gary's grandmother, on whom Jason has a crush.

Jason always tries to play on to Gary's grandmother, by wiping her spillings and sucking her toes, the latter of which makes Gary and Jason fall out.

A sketch is included in the Deleted Scenes of the Series 2 DVD, where Jason is having sex with Gary's grandmother. This sketch was originally planned for the TV series, but Matt and David have self-censored themselves by not showing it.

Source: wikipedia.org