Sorry I started the ball rolling and then just left it! That was a very interesting article Samson. I suppose I'm fairly gobsmacked in general at the "dating" practices of today's young people.
I came across this other article from back in the summer. The case highlighted at the start of that has many similarities with the Millane case.
https://www.theguardian.com/society/2019/jul/25/fatal-hateful-rise-of-choking-during-sex
Vicky Wynne Jones was actually murdered by her husband, and he also fell back on the "sex game gone wrong" defence, and again it was his behaviour afterwards that was so damning. Like the Millane accused he his the body and tried to cover up the killing, and he was also having affairs. There is a suggestion in that case that there might not have been any sex game at all and that it was a premeditated murder because Vicky had found out about the other women.
In the Millane case I don't think he invited her to his flat intending to kill her. I think the body-disposal would have been better prepared-for and better thought-through if that had been the case. And I think he was really into strangulation during sex, as these other dates of his seem to indicate - although to what extent they are all telling the full and honest truth I don't know. I'm still waiting for any evidence that Grace was a willing partner in the strangulation though, I suppose some evidence may well come out about that later.
I suppose in general I agree with isissxn, with the caveat that whether or not she agreed to be strangled might be quite an important point.
But if it was an "accidental" killing during a sexual encounter, however non-consensual, and he didn't actually intend to kill her, is that actually murder? And if it isn't, then does his attempt to conceal the body turn it into murder?