P: Praise
Praise is an important part of many cuckold relationships. Cucks love praising their hotwife/hothusband, as well as the latter's bull(s). In fact, letting yourself be cucked is the ultimate praise and acknowledgement that they're just better than you in important respects.
However, many hotwives/hothusbands also love praising their cuck. They love telling you how much they love you -- it's just that you cannot please me sexually -- and how grateful they are that you allow yourself to be cucked. It is thanks to your undying devotion and loyalty that they can have the amazing sex life they have. Yes, they have the best sex life thanks to you -- just not with you! And, it's not just that. Another man's dick may curl their toes and have them shout out that man's name, but you're the one they confide in, you're the one they want to tell about their day, and you're the one whose shoulder they cry on when they're going through a difficult time.
You're still the most important person in their life, even if they get their sexual thrills elsewhere, and a good hotwife/hothusband will regularly remind you of that -- and praise you for the strength it takes to be a loyal and committed cuck. That knowledge is what gives you that strength!
Remember, hotwives and hothusbands: cucks love hearing how much their sacrifices are valued. Praise them for this, as it makes your dynamic sustainable!