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im not sure, but is it http://www.mangago.zone/read-manga/dotei_yankee_magicus/
no but sounds like a good manga too :)
no, but thats a good manga too :)
tysm :)
its kinda older and completed, the uke has the power to transform and saves people but has to consume semen to do so, and its a power that was passed down from his mother and previous female members in his family. he meets the seme when he needs to transform and uses him but the seme finds him again and they fall in love etc...