Domination
Scene 2
Once they were settled, together they broached the subject of a submissive/dominant relationship when in private that was quickly agreed to. They chose between them to go pretty much the full extent with Harry having complete control over Hermione but also included the safe word spell.
Harry started it off with making Hermione wear a special outfit around the large manor they resided in whenever they were alone. The outfit consisted of a full body corset, crotch-less thong, collar and thigh-high boots with a stiletto heel all made of dragon hide. Specifically, the hide was off the nesting Hungarian Horntail mother he had faced in their fourth year in the Tri-Wizard Tournament he was made to participate in. The dragon had died of natural causes so Harry bought the entire hide from it off the preserve it had lived on. Also the stiletto heel was so high that Hermione was unable to walk without help so had to rely on him.
He'd gave his house-elf Kretcher, the important task of making the items, which he successfully did despite how hard it usually is to work with dragon hide. Then Harry instructed him to assist Hermione in putting it on each morning when needed to but he was only to do the lacing on the corset and the boots, Hermione herself was to do the rest as she could tell if they were right.
Also Harry used a semi-permanent charm on her throat as to prevent any problems that'd likely arise with restricted breathing from the corset. As such, the lacing on the corset was to be fastened as tight as it possibly could on her with her tits being lifted as high as they could but then with her nipples clearly on view and accessible.