here's my thoughts and prayers
Wife is definitely the best for this, a classic burnout marriage for the initial plot is always good and you know what they say, don't fix what's not broken but anything fine and really, it all depends on the kind of progress and ending(s) you want.
I do like for the cuck to straight up not in the scene and let him imagine (or imagine
with sound) what happens with his wife's sexy time. The classic's wife going to a hotel and you do a live call is nice, I really like a "go to the other room" and listening to the moans better though but are erotic in their own way. Going to the other guy's own home and she spends the night is always good as well.
Ideal guy can go either way really, Mom/Son Wincest is nice, Dad is alright, MCuck or Wife's Office Boss is solid as well, good old chads/neets/innocent-virgins/ugly-old-man, etc is also fine. They are really dependant on the story and the dynamic you want. If it dad or son thought, you can get a tasty: wife going to sleep with them instead of you instead and in the morning you got late at work because you need to wait them fucking like animals at the bathroom before you using them kind of scenarios.
I gotta say, I'm not into Black Bull and prefer Muscle Gyaru-oh instead, it's just personal preferences and I'm not American so the extra race reasoning is not in me. I feel like Black Bull is played more into the interracial side while Gyaru-oh is a natural womanizer so it fits better for cuckolding for me.
I prefer MC not joining ever and at the same time, them going "MCuck-kun dick is small and not satisfy me like you" kinda overdone and lame. You mention drugs and I think depend on the story progress you want, that could be a good and nice transition into MCuck humiliation, like the wife so disappointed by what the MCuck does to her and so she starts to abuse him with words as well
and it makes her more aggressive with the cuckening and MCuck might feel bad and he slowly lets her wife do whatever she wants with her lust, Sloppy second is wack but you can use this naturally this way.
Impregnation should always happen and it should always be delivered.
I like one guy to completely own her but again, it depends on the kind of story you want.
I prefer 2D>HoneySelect>Daz.
VN is nice but being an RPGM doesn't need to be too "RPG-Like" you know, it's fine if it's a bit more straightforward or as simple as a VN.
This
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is some of my favorites and
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turns me on
A LOT, something about it just delivered really well.