Old Trap to Futa/Shemale transformation doujin

Nightfox278
I need help finding this old doujin that I read a long time ago. I think it was about a trap who goes to a convention or goes somewhere with a group of futanari's and ends up going to the bathroom with them. They explained how the prostate is a dorment womb and by fucking his ass, it would transform him into a futanari. He then transforms into a futanari. Some of this might be wrong. If you can help thanks.

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