Pretty important to the story, Nishimura made a really long and detailed post further explaining their relationship with Queenstion. 3 days ago. I wasn't paying attention at the time, oops.
Reading that account, Nishi was a vulnerable person before that Queenston fellow got involved: Nishi had been raped earlier in the year before meeting Queenston, was suffering badly from PTSD and anxiety to the extent of having blackouts (waking up confused and not remembering what happened) and had extreme difficulty in dealing with people demanding sex.
In that account Nishi described various occasions where Queenston had sex with/sexually touched Nishi, despite Nishi not wanting to and saying so. Additionally, at one point Nishi was wearing a collar and Queenston grabbed the collar and jerked Nishi about.
The furry subculture has some very vulnerable people participating in it and they can obviously be taken advantage of. Hopefully people will be more aware with the recent Zaush issues and this.
From a UK perspective, according to the Metropolitan Police:
"A person commits sexual assault if they intentionally touch another person, the touching is sexual and the person does not consent."
^
http://content.met.police.uk/Article/Definitions/1400008450549/1400008450549So someone in the UK behaving as Renard Queenston is described as doing would be committing sexual assault at the least.