When a male or futanari ejaculates while being anally (or vaginally, in the case of futanari) penetrated by either an object or a body part.
Not to be confused with female ejaculation or cum in pussy. The person ejaculating is the one being penetrated, not otherwise.
The following tags are aliased to this tag: cum_while_penetrated and ejaculation_when_penetrated (learn more).
This tag implicates ejaculation (learn more).
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