Rule34.GG

Regular 1girls
arms behind back
bare legs
black serafuku
bondage
bound
bound arms
bound to chair
bound torso
breasts
chair
chair bondage
choker
command spell
crop top
fate/grand order
fate (series)
female
femsub
gag
gagged
large breasts
layered gag
long skirt
minamoto no raikou (fate/grand order)
pleated skirt
ponytail
purple eyes
purple hair
putting on gag
rope
rope bondage
ryner-e
school uniform
serafuku
side slit
skirt
stuffed mouth gag
sukeban
tape
tape gag
taped mouth
tied to chair
tied up
very long hair