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What are you talking about, teacher is an adult. You're not suppose to have sex with a minor, specially if he doesn't feel aware of even sure of his own sexuality, you don't have the right to take that and make it yours in anyway. Also he's your student lmao, where's the ethics? Girl please, are you even real lmao
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I do think what they did during that time was a bit rash especially with the current setting they had. I guess I didn't viewed Kanda as a real teacher for being a home tutor to his friends brother that it never did hit the subject of morality of a teacher-student relationship and viewed him rather as an older acquaintance. But still Kanda never did give obligations to Akira to continue their sexual relationship. And yes, I am real. :)
Maybe it's because of my environment but most of my friends lost their virginity around the age of 15. Akira was probably around 15-16 when he did his first sex since he's going to high school testing procedure. Him having sex at that age or having a sex partner does not label him as slut or any deregatory words so please stop pushing your idealistic views and principles to other people.
I find Kanda and Akira's relationship rather open and healthy when viewed as them being sex partners. Both of them does not coerce or threathen the other to have sex. They have each others consent to move forward with sex and that is the most important thing may it be in fictional or real world.
Akira also did not wronged Kanata in anyway. Kanata knew Akira was having sexual relationship with someone. Akira might have omitted some of the information about his sexual relationship but please remember that he is not out of the closet with Kanata. Lastly, they are not in a relationship. There might be moments where they teased or hinted each other about their feelings but it was not explicitly stated.