A character having an orifice ([[pussy|vagina]], [[anus]], mouth) being penetrated by a [[penis]] or [[object insertion|other object]] through a gap too narrow for the character's [[ass]]/[[head]] to pass through (e.g. [[fence]], [[bars]], [[cage]]).

Similar to [[glory hole]] but the gap is not a simple hole designed to fit a disembodied penis.
penetration through barrier