rule 34 ambiguous gender american opossum andromorph anthro tion bite mark in mouth bodily fluids bondage bondage bound breath play gradient tail hands behind back hands tied behind back hi res hybrid intersex knottytracker mad maddox male mammal marsupial mastectomy scar murid murine nipple piercing nipples nose piercing rat rat tail restraints rodent rope rope bondage rope harness scar solo 8810011