Halibel, Rangiku, Nel, and Yoruichi in a foursome lesbian orgy (omit Yoruichi if only 3 chars are allowed, the rules are slightly misleading). One of the girls (Rangiku or Halibel, take your pic, is being pleasured/serviced by the others in a position similar to:
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With fingering, tit suckling, etc. The one being serviced by the others should show a similar facial expression.