S: sph or small penis humiliation
Small penis humiliation is such an important part of any cuckold relationship. Even if you're not actually that small, it doesn't matter. What matters is that your hotwife/hothusband can get better sex from other men -- better men. Accepting that you're not good enough sexually, which is very different from being inferior in general, is the first step to becoming a good cuck. It is crucial for accepting your place.
Furthermore, there's a good chance that your hothusband/hotwife and their bull get turned on from humiliating you, maybe making you show off your tiny cage to their big-dicked bull, or comparing them unlocked -- which is really even more humiliating. The humiliation reinforces your submission and their arousal; it is perfect foreplay!
Importantly, knowing that their bull makes their toes curl in a way you never could is all you need to know to remind yourself that no matter how humiliating and painful it might be to have that comparison or hear them scream another man's name, you made the right choice in letting yourself be cucked -- even having begged them to do so.
Besides, it turns you on to be called a tiny-dicker loser cuck, doesn't it? Don't lie! They can see you strain in your cage when you're blushing -- trying to look away from the humiliating side-by-side, but fascinated and wanting to stare at the bull's massive cock at the same time!