I have followed the advice given in the game walkthrough and achieved every possible ending listed.
During the first multiple rounds of playing this game I did indeed try being very sensitive and indicated my feelings for Duncan, but everything time I did that, Duncan's could not overcome his nervous anxiety and could not become intimate or try same sex activity. I was indeed getting annoyed and frustrated at my lack of progress.
I then realised that this was because Duncan had never attempted anything with a man at all before, I then decided to try a more casual open approach to Duncan.
The key factor was that Bryce needed to indicate that this intimate exploration of Duncan's sexuality could take place as a private one-night stand with no strings attached.
Under those circumstances, If Duncan didn't like sex with a man, he was then able to continue on with life after having satisfied his curiosity.
I fully understand the interpersonal dynamics displayed in the "Kink" ending. Duncan is under a lot of pressure, his work obviously carries great responsibility and accountability.
Duncan would get a great deal of stress relief by allowing a trusted loving partner to take full control and be responsible for domestic and intimate matters after his working day finished.
At the very beginning of their relationship It would also be a big relief for Duncan to allow Bryce to take control of things sexually as he has no experience in same sex activity. He would be worried about what to do to satisfy his partner.
I would love to see more content for Bedding the Boss, I would very much like to see how this relationship develops and hopefully it will end with them openly getting married, Duncan is such a handsome, sweet, loving and sensitive person whom needs someone to love after nearly 11 years of being alone.
I am very hopeful that you will eventually create a sequel to Bedding the Boss.