Mojo to Hime-sama Irekawari Isekai Tensei: Oku Made Uzuku Kiss wo Shite

"Oh gosh, you're soaking wet. That's a beautiful sound, isn't it, princess?" as the handsome prince's long fingers explored her most sensitive places. It's her first time… and the feelings are overwhelming…! She was an unwanted woman who resorted to masturbation to pleasure herself. Until one day she suddenly switched bodies with a princess from another world! She promised to try her best to play the role of the princess and not cause any trouble until they could swap back. But it turned out the princess had an engagement party to attend!? Her fiance the prince seemed so handsome and perfect, but he actually had a naughty and sadistic side to him…? When he talked dirty to her and commanded her to do things, it drove her perverted mind to climax… totally unable to resist! (Source: Otomechika Shuppan, translated)