Kuroko simply said that if anyone wants to get it on with Mikoto, they should go through her first. Touma takes this literally and happily accepts, and Kuroko then seems to not mind, despite saying that she already has her onee-sama as a love interest. This pisses off Mikoto who apparently witnesses the scene, and she kills them both (I assume from the amount of blood).
@Sapphi -
”ただ、二十(個 or whatever counter is appropriate)しかないですよ。”Originally Posted by Sapphire
"先生が三時に空港(へ)着くんですが,だれかに空港むかえに行って(もらいます)か?”Originally Posted by Sapphire
"週末パーティーに妹(を)つれて行ってあげようと思っています”