Yuusha Chan No Bouken Wa Owatteshimatta – Episode 2

Our protagonist - who kicked the demon king's ass and restored peace across our realm - has turned into a haughty little bitch. She may still breeze through battles with whatever remnants of that foul fiend's forces remain, but she can't level up no more. That ain't all though; she starts having these fucked-up dreams where demons are fucking her down in Hell and it feels so damn good that those nasty bastards just eat away at her mind! But hey, guess who found the source of this nightmare? The girl did, but she was already too far gone to resist those horny demon dicks. And every night, they're making their way further into her body 'n soul.