Yandere Osananajimi no Kuroi Dekiai: Iki Heki Tsuku made Choukyou Kiss

I'll teach your body to cum just by insertion. The gentle childhood friend she always loved displays a twisted form of love. As they have sex, her naive body becomes tainted with indecency... The day she got her job, Chihiro Kosaka confessed to Shiki Motomiya, who she had been crushing on for the past 14 years. But when she does, Shiki smiles in an unsettling way and completely changes his attitude...!! "I won't stop until you memorize my shape with your vagina." Shiki intensely pounds Chihiro with his overwhelming love to engrave himself into her. The sex with her obsessive childhood friend deeply corrupts Chihiro's pure-white body and heart...

(Source: Coolmic)