The only things that are really a turnoff/DNW to me are scatplay, adult-baby/infantisilation/diapers, and extreme permanent changes like amputation.
Scene elements I really like include but are not limited to: nipple torture/CBT, suspension, pegging, object penetration, whipping (stinging more than thudding), breathplay, knifeplay, gunplay, electrostim, all sorts of D/s roleplaying up to and including fake non-con, anything anal, dirty talk, bondage, threat of involving strangers, "forced" oral, display of the sub's body to others, endurance tests.
Optional details are optional, though. I don't expect any of that, these are just suggestions.
Re: Sherlock/john/Irene - D/s
The only things that are really a turnoff/DNW to me are scatplay, adult-baby/infantisilation/diapers, and extreme permanent changes like amputation.
Scene elements I really like include but are not limited to: nipple torture/CBT, suspension, pegging, object penetration, whipping (stinging more than thudding), breathplay, knifeplay, gunplay, electrostim, all sorts of D/s roleplaying up to and including fake non-con, anything anal, dirty talk, bondage, threat of involving strangers, "forced" oral, display of the sub's body to others, endurance tests.
Optional details are optional, though. I don't expect any of that, these are just suggestions.