"Gomennasai... Irete Kudasai": Sex de shika Iyasenai Hatsujou no Yamai

There's an illness that causes sexual arousal. The only way to save my cousin from this burning sensation of sexual arousal is to continue to make her have orgasm after orgasm.
(Source: Coolmic)
Note: Simultaneously released in long-strip and traditional formats, with 12 episodes and 4 chapters respectively.