Also known as: ところてん, メスイキ, トコロテン, 被插入时射精
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.