Rule 34 Dev - 1girl 2018 ambiguous_penetration anthro areola ass bed bedroom book breasts brother brother_and_sister closed_eyes cowgirl_position cum cum_in_orifice cutie_mark duo electric_spark equine eyewear fan_character female female_on_top friendship_is_magic furry goggles hair hand_on_breast horn incest inside lamp long_hair lying male male/female male_penetrating mammal multicolored_hair multicolored_tail my_little_pony nipples nude on_back on_bed open_mouth penetration penis princess_celestia_(mlp) princess_luna_(mlp) sibling sister sweet_voltage testicles twincest twins two_tone_hair unicorn zwitterkitsune|738616