https://civitai.com/models/1781818/aio-on-back-straitjacketsuspension-or-ring-around-the-posey-or-ilxl

Str 0.8 to 1 (1 will work better with the thigh>ankle connections)
lying on back, straitjacket, thigh straps, arms crossed, feet together, knees apart, bound ankles

Or

lying on back, straitjacket, thigh straps, arms behind back, feet together, knees apart, bound ankles

Lastly, as a suspension

((suspension, restrained from ceiling, bondage)), bound ankles, from below, thigh straps, arms behind back, feet together, knees apart

I think this had a ring gag, best prompt is ring gag, teeth, tongue