Dousei Yakuza no Kare ni Kinyoku Sasetara Loveho de Shinu Hodo Okasaremashita

Minato has been living with Renya, a yakuza gang leader, confined (?) in his house. Feeling guilty about their debauched daily lifestyle, Minato declares a “celibacy order” to Renya! She thought Renya, who has been insatiable, wouldn't be able to wait quietly, but her day of reckoning comes all too soon. Moreover, she finds a love hotel membership card that fell out of Renya's pocket…

(Source: DLSite, translated)