[赤兎 (復八磨直兎)] 姉弟子研究会 (りゅうおうのおしごと!) [DL版]
#385767 - He starts to say something. She looks him straight in the eyes and tells him to “shut the fuck up”, punctuating her command with a hard smack with the crop on the pillow next to him. Meanwhile Karen is continuing to stroke him with two fingers, bring him slowly up to the edge of a climax.