k-on!, tainaka ritsu, s zenith lee, sketch, 1boy, 1girl, arms behind back, bad end, bdsm, belly, blood, blush, bondage, brown eyes, brown hair, bust, drugged, drugs, female, gag, gagged, hairband, hands, improvised gag, injection, navel, nipple injection, nipple play, nipples, nipple torture, nude, one eye closed, pain, pettanko, short hair, shoulders up, simple background, skinny, solo, sweat, syringe, tape, tapegag, tears, topless, torture, white background, wince, wink