![2boys arm_support bad_id bad_pixiv_id black_hair blue_eyes blush briefs brown_hair bulge free! glasses green_eyes grey_briefs hair_between_eyes highres hitachi_magic_wand holding_hands hood hoodie kneeling leaning_forward male_focus multiple_boys nanase_haruka_(free!) no_shoes pants pants_around_one_leg pants_down pink_background semi-rimless_eyewear shirt short_sleeves shouno_kotarou sitting socks sparkle striped striped_shirt t-shirt tachibana_makoto underwear vibrator wavy_mouth wet wet_clothes yaoi rating:e score:2 post #1850301](/cdn_image/preview/7c/98/7c982a68f1dffc3c3010daa47113bce3.jpg)
An electric massager first released in the 1970's for medical use, it was quickly picked up and utilized as a sex toy. It looks like a strange microphone with a white and/or gray head that vibrates.
Its pixiv tag is 電マ (den-ma), an abbreviation for 電動マッサージ機 (electric massager). Not to be confused with denki anma.