[ODV-558] Perseverance once a week

Marina's problem is stubborn constipation, which barely requires one bowel movement a week... However, I couldn't forget the feeling of that anus sucking out a large amount of feces that had accumulated in the pool before I knew it, and now I desperately hold back the urge to defecate for a week and put it in a diaper... Or I secretly looked forward to defecating as much as I could while masturbating.