Akuyaku Reijou Wa Itto Ni Dekiaisarete: Noumitsu Sex No Aitei Wa Jyuuboku summary:

"I know you won’t be satisfied with anyone but me"I know we shouldn’t be doing this... But when his tongue licks those places I can’t help but want it somewhere deeper.One day, Karen realizes that she’s been reincarnated as the villainess in an otome game. Furthermore, following the plotline, her engagement to the prince will be broken and her family ruined. In order to avoid the worst end, she locks up her feelings towards the prince’s bodyguard, her childhood friend Hansel. But one day Hansel saves her when she’s in a tight spot and her locked up feelings start to overflow. He passionately kisses her while saying “Forget about this”, but her heart and body are already his.