Real third Wheel 

A person that has sex with a couple

A coupe devil status

Technically

Proper definition of a third wheel , roll together completely

married couple invited their friend to have sex with them and they fucked

That friend was the third wheel

Alot more stable and control achieve

Definition by Mr.Gusher / Soapy Sardines

Real third Wheel

Real third Wheel by SoapySardines aka Dorian August 19, 2018