Gakuseikai-shoki Ni Tokkun-shitai – Shijuuhatte Battle no Seijoui Oshiete ~ Coach [English], an hentai doujinshi parodying the Kaguya-sama wa Kokurasetai (“Love Is War”) series, by Ginhaha

In the Kaguya-sama wa Kokurasetai series, on several occasions, the male MC, shirogane, receives comedy training by the series’ moe argument, Chika Fujiwara, the only busty girl among the main characters, a total airhead but with surprising skills and a good nature. These are funny comedy moments, indeed, Shirogane sucks at plenty of things but is a hard worker, so once he’s thrown under the wing of an unlikely coach who doesn’t even trust he can improve, it’s hard not to smile ^^

Here’s the hentai version of those mini-coaching events. Shirogane’s sex with Kaguya is all over the place, so “of course” (an hentai universe kind of “of course”) he goes to his usual coach, Chika, to ask for help, to learn the ways of normal non-awkward sex ┐(￣ヮ￣)┌
That was kinda weird, in the end, of course Chika would get attached to Shirogane and be sad once the coaching was over and he would finally go back to Kaguya, but, eh, so willed the mangaka.

–Update: thanks to the kind work of Hentai_Doctor, the doujinshi is now available in proper and well typeset English, a worthy improvement over the broken and bad-looking English the mangaka had provided himself.

Plus, the art is pretty nice and hardly even censored

For more Ginhaha glory, see The list of all his works on Hentairules!

Oh, yeah, also: the artist has a Patreon, under the ぎんハハ / Ginhaha names, and check his Pixiv for more lewds

And now, the download & gallery links

Open the Complete Pictures Gallery

Or you can also use the Alternative:
Zip Mirror #1 – or – Zip Mirror #2 – or – Zip Mirror #3