Some couples like to include chastity as part of DD and it does have many benefits. It removes your partner’s ability to orgasm without your permission which leads to higher obedience, them being more loving and dotting and when removed incredible sex.
For partners forcing or encouraging their partner to wear diapers, chastity when not wearing can be used as a conditioning method to increase their desire to be diapered. Knowing you can only cum in diapers will help remove objections to wearing.
A chastity device easily fits under a diaper and can be cleaned easily during changes. Chastity periods range by couple, from whenever not in diapers to several weeks or months at a time.
Experiment with it and find what’s right for you, you’ll often find you love then new control this gives you.