I actually wasnt a huge fan of this one. Because it centered around couples but being in open relationships. While yes that happens and people are poly, and I know many friends who have the same relationship with other couples in a group I find this one not to be for me personally.
However the manga you linked is one of my favorite centered around this genre because it depicts this world in single relationships and without partners very accurately. I've been involved with the world myself (many years ago) and in the gay and lesbian worlds that manga is very much how the harder bondage and BDSM is. There are many different genres of BDSM and this one is very calm verses the one you linked. They to me cant be compared.
Well hoshi no yakata is very rapey in some scenes. It is pretty depressing at quite a few points as well. It's not about how hard the bondage is; I'm talking about how poorly the people will treat each other outside of sex in that manga. They are not healthy relationships. If it weren't defined as a bdsm manga with all the sex scenes I think most people would see their outside interactions as more disturbing and sad.
Good depiction of BDSM. Now not all BDSM fetishist have a friend group with the same fetish that they all hang out with and take part in.... activities... with, but I'm sure some do. I also thought the main couple was very cute; they incorporated their love but also had a very healthy sex life that they weren't ashamed of. I've never liked a yaoi centered around BDSM before so this was refreshing.
it is totally unlike this http://www.mangago.zone/read-manga/hoshi_no_yakata/
which was a super gross and horrible depiction in my opinion.