Mijuku na Mame ga Sodatsu made

Hotaru, who is shy and has low tolerance for men, is helped by Satsuki from her cooking class. He's kind and friendly, and doesn't seem like the kind of man that she dislikes. But when Hotaru gives Satsuki some chocolate with liqueur in it... He pulls her arm tightly and kisses her. "Come on, come harder," he says, and as he teases her sensitive "little bean," her hips lift and her juices flow. She feels pleasure pulsating all over her body, she's never felt anything like it! He's transformed, and his lessons on how to come begin, and she ends up becoming his practice partner to help her build up her tolerance for men...!?

(Source: Shuusuisha, translated)