u/SS_beny237

I am looking for this hentai I saw long time ago. Story starts as Megumin goes to the Wiz and wants something that makes her stronger. Wiz gives her coffin like chamber machine and says that it will help her.
Megumin drags it back home and gets inside, then the device will start to pleasure her and (if I remember correctly) the device says "if you want to do this indefinitely you must cum" of course Megumin cums and gets trapped inside. the story ends with Aqua asking Kazuma where is Megumin and he says that she is in her room and that she is training and she will get out when she gets hungry.