Gin-san takes history lessons, and teaches you how to hide your porn mags?
Tsukuyo tries to teach Seita history, the subject he's not great at. However, her training (?) methods end up leaving him scarred, which makes desperate Seita ask Gin-san to take over as his tutor...
I get how amazing nipples are, 
but could you keep it down?
أدركتُ روعة الحلمات، لذا أخفض صوتك
¡Comprendo lo genial que son
 los pezones, pero baja la voz!
Entendi que mamilos são 
incríveis, mas pode falar baixo?