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abdominal_bulge anal_hook anthro bent_over bodily_fluids bound creature_inside cum cum_in_vagina cum_inside cynthia_(sentharn)deep_penetration dildo edging electrostimulation female forced forced_orgasm fucking_machine genital_fluids laboratory laboratory_equipment limb_slot living_insertion machine mammal mouse murid murine nude orgasm penetration pent_up raised_tail restrained rodent scientific_experiment scientific_instrument sex sex_toy story story_in_description submissive submissive_anthro submissive_female tail teasing test_subject vaginal wandering_lizardfolk