: Suzannah appears to be moving further towards enforcing sexual pleasure for her can only be meaninfully achieved by Paul now.
: Stef needs to feel more conflicted and tortured. Part of being a cuck (at least the hottest version imo) is mental anguish.
I like the new change of Suzannah not cumming when she has sex with her husband and also making him finish quick. It's a good trade off for still having sex.
I do think the double condom idea mentioned above could be hot. I feel something along the lines of Paul finding out stef doesn't really have ED and feeling a little betrayed to turn things a little darker and torment stef a bit more. A darker turn where Paul becomes more possessive and the wife finds out she either enjoys it or is fairly indifferent to the torment that Stef will have to learn to cope with. Unexpectedly they just shut the door on stef and lock him out. Set some kind of boundary that Stef is not happy with but isn't a deal breaker.
In any case I do really like the new idea that she only cum with Paul, I think that is a winning idea and has legs to it.