Heart Mark Oome.

Asahi, who secretly harbors feelings for him, has discovered that his stepsister Reika is actually an erotic manga artist! Without missing a beat, Asahi smoothly becomes Reika’s assistant. One day, Asahi calls out to Yuu, but Yuu already knows the lewd atmosphere she’s giving off…! Just like Reika, Asahi attacks him driven by jealousy and lust! After finishing having intense sex with her and heading home, Reika already knows everything…? Caught between his stepsister and the girl he likes, will he be fucked until he’s completely drained…!?