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TIL the answer to your question is "nakadashi" (literal definition is exit inside also used as slangwhat we call cream pie) or "nakadashimasu" (verb tense for I'm coming inside).
The Jap toon porn people use it for what you said and sometimes add an xray pregnancy after.
I don't search the Jap stuff anymore. The people that ran TOGIH before I took it yelled at me that it was Lolli crap I shouldn't be touching and then I learned those GG cup tit sized girls that looked adult were actually only 8 and fucking their brothers.
Good times!