[Akao, Anaran] Konomi ja Nai kedo ~Mukatsuku Ane to Aishou Batsugun Ecchi | She's Not My Type But ~Amazing Sex Chemistry With My Annoying Older Sister~ 5 [English] [KenGotTheLexGs]
On page 10 where they're arguing, it seems they have been arguing for quite a while before we see them in that panel. I couldn't really tell what Ritsuki was saying before hand plus I had a hard time trying to figure out what she meant when she said "余裕なさそうじゃん" so I just translated it as "Like you have any right to talk" since they are arguing.
Edit: @junk123455 Or maybe I do and just that I don't understand that phrase because I've yet to learn it?