How to use a sex toy and my penis in my girlfriend at the same time

A little egg vibrator, the kind attached wired to a remote control stick.

But if you wanted a dildo of some kind, you'll probably want some kind of butt plug so it won't slide out unexpectedly while you're doing your work.

well its  very  easy. first yu thrust  the didlo in her  ass little by littel while kissing her and

then u put  ur  nice big  huge penis in her  p***y at  the same time  as you  push the dildo slowly in and out  of  her  ASS.