Centerpiece

[Tanya Shivari]

The person in the middle of the [circle jerk] or [gang bang] (or acts which are similar) whom all of the outer circle focus their attention too or ejaculates toward, when a circle or shape is created.

The centerpiece may also interact with with surrounding people.

[Julian]

the [weird-ass] [brownish] thing in the middle of a womans [tit]

[Mark Zuckerberg]

A decorative piece or display placed in the middle of a dining or serving table.

[exinilu]

US spelling of centrepiece