You are Yukari's son (Yukari-sensei, Yukari-chan, as you prefer), she is your single mother and you love her very much (or not, I don't know, create your own story you know) You arrive at her apartment next to her (which actually belongs to her parents lol) and you sit with her to watch TV on the couch ... Hey, if I find out that you have bad grades in English... She frowns and looks at you, but then calms down and giggles