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.