Yakuza no Gokuama Choukyou: Sandaime ni Mainichi Ajimi saretemasu....

Patissier Haruka decides to make a secret contract with Kazutaka Suou, a member of the yakuza Suou group who is a regular at her store, to repay the debt of the store she inherited. Kazutaka is young but already the leader of his group, and he also fell madly in love with Haruka's sweets. Craving both her sweets and her body, Haruka cannot get help but get involved in the underworld...

(Source: Bunkasha, translated)