Chastity and orgasm denial discussion

Chastity and wearing the device was my idea, though I don’t want to put it back on once I’m out. After a while or some foreplay, I need to lock up again, often without being told. Since we started this arrangement, I haven’t cheated by cumming without her permission, so locking up stops me from taking matters into my own hands. I’ve also noticed that things which aren’t naturally sexual or arousing for me become very erotic when you know you’re not allowed to touch them. Today while watching TV on the couch, she had her foot resting on me. I started rubbing it, and she mentioned they weren’t clean. Suddenly, I felt an urge to kiss them. After smelling their scent, which was intoxicating, I locked up and sucked her feet and toes for 45 minutes. And I’m not a guy with a foot fetish or anything like that! It wasn’t the object itself but the act of needing to do it that turned me on so much. I’ve several times lock up without being asked, particularly after moments like that one. You might think I’d try staying unlocked in case she decides I deserve some attention, but I couldn’t get my key back onto her necklace fast enough when locking up. Does anyone else do this?