EBWH-188: Putting a Chastity Device on My Obedient Little Boyfriend and Denying Him for a Month Turns Him into a Super Lustful Beast! The Tables Turn Dramatically, and Big-Titted Big Sis Gets Sent to Heaven Over and Over, Unable to Stop - Alice Nanase

Gentle big-breasted big sister Alice Nanase puts a chastity device on her obedient little boyfriend and forces him into a month of abstinence for training. The originally docile boyfriend completely erupts after prolonged repression, transforming into a super lustful beast. The positions instantly reverse, and the sister is sent to orgasmic paradise again and again by her boyfriend's wild onslaught, completely unable to stop this intense sexual frenzy.