Read Fantasy Bishoujo Juniku Ojisan to Manga:
A dull old man and his handsome best friend were summoned to another world by a naked goddess! However, because of the goddess mischief, he has turned into a peerless beautiful girl?! To get back his body, he has to go on a journey with his best friend to defeat the demon king!! "An old man that became a beautiful girl" and "A handsome old man"! Let the madness filled another world journey more.. rom-com begin!!