Posts depicting a sub-fetish to penis milking, in which the semen, once extracted from the body, is then immediately re-routed and forced back into the subject's body through more tubing, generally through forced oral ingestion. May also apply to closed loops involving more than one character.
Not to be confused with
- feces_circulation - while related to the circulation tag, it is NOT the same as cum_circulation
- urine_circulation - while related to the circulation tag, it is NOT the same as cum_circulation