Looking for sauce
>>380441
reverse image search leads to a Sankaku Channel link [NSFW] with tags
this is from "Oniichan dakedo Ai sae Areba Kankeinai yo ne!", OniAi for short
you could also have cropped it to one frame and fed it to whatanime.ga
>>380449
Duly noted, will bookmark that site. Still, thanks for the spoonfeed