Danbooru-based image board with a specialization in high-quality images.
animal_ears gokou_ruri kanna_asuke kousaka_kirino kousaka_kyousuke maid makishima_saori ore_no_imouto_ga_konnani_kawaii_wake_ga_nai thighhighs

Edit | Respond

Probably horny waitresses insisting on wiping a coffee stain on the customer's crotch.
I would hazard a guess that the one in the right frame with the glasses is responsible for pouring the cofee on him, Ruri is getting embarrassed at the thought of wiping it or the trousers coming off and Kirino is demanding she take his trousers off to wash them?
I think Ruri and Kirino are equally turned on as each other, Kyosuke is trying to get Saori to get them away from him and Saori is just making fun from the sidelines.