k-on!
tainaka ritsu, tainaka satoshi
abubu
1boy, 3girls, age difference, blush, brother and sister, closed eyes, greyscale, grin, hairband, hetero, incest, long hair, male masturbation, masturbation, monochrome, multiple girls, onee-shota, panties, sakuragaoka high school uniform, school uniform, shota, siblings, smile, sweatdrop, topknot, twintails, underwear
commentary request, highres, partially translated, translation request