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...
and the lingerie pages of mail-order 
catalogs are enough to satisfy you,
وصفحات الملابس الداخلية مع قوائم الطلبات البريدية تكفي لإرضائك
y los catálogos de lencería 
por correo no te satisfacen.
que as páginas de lingerie em 
catálogos de venda já bastam.