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2012 alien alien_(franchise)astrozerk basic_sequence breasts eyewear female flaccid gender_transformation genital_growth genitals glasses growth human human_to_humanoid humanoid linear_sequence long_image male mammal masturbation mtf_transformation multi_frame_sequence nipples nude penis pussy_growth sequence simple_background six_frame_image six_frame_sequence solo species_transformation tail transformation transformation_sequence vaginal vaginal_masturbation vulva wide_image xenomorph