https://civitai.com/models/1904048/tied-genitals

Leashed genitals, need to put "leash and collar on neck" negative, leash is unstable use rope instead

Sample prompt: lustful expression,small breasts,) , large thighs, looking up at viewer,, ,pov man hand in view ,lips, legs, , small testicles, femboy, flat chest, top, skirt, stockings,long gloves, standing, transparent, she is sit on the edge of bed with legs open, (Self hand pull the rope tie from testicles :1.6), tight tied, front view