Hello!
I (f23) have found out that my partner (m24) has an unconventional version of this kink and I would like to do some research on how we can incorporate some aspects of it in our life, especially that he seems to be not the most comfortable with it still so I wanted to educate myself a little bit :))
For context, I am very thin, a little underweight and have a build that is generally considered quite petite. My bf has told me that he has a strong preference for very thin women and it shows during our sex that he focuses a lot on my collarbones, ribs etc. HOWEVER he has also told me that he is also attracted to very chubby women and the most "hot" thing for him is the contrast between very thin and very chubby women and also the aspect of body transformation and hedonism (the idea of "destroying yourself").
He would not like me to gain and I'm also not interested in gaining but I thought that maybe we could include some roleplay or kink activities in our sex life that would be fitting for this sort of fetish but it seems a little hard to actually do irl so I'm looking for ideas and if there are maybe more people who have similar experience!