Of course he teaches Hana to read and write. She loves him all the more for it.
Epilogue plot twist:
After half-orc babby #2 is born they start to worry if a orgy-having free-loving nudist hippie commune in a murderous wood is the best place to raise kids. Hana, while nursing the latest little halfbreed in the firelight (and looking like the loveliest woman in the world t. hot foreman orc) worries about how they'll make do if they move to the big city where you have to pay for stuff.
Turns out the goats, for all their bullshit, pay handsomely with loot gold because hippe goats don't care for capitalist crap like money, clothes or household items and also the job is dangerous. Hot foreman orc has essentially been making crazy oil rig money for years without any booze or whores to spend it on. He's fucking loaded.
They move to a nice place where hot orc can do his architect engineer thing (still shirtless, such is his way) and the kids (they just keep coming) don't grow up like savages. Hana writes a cookbook. They're that annoyingly perfect couple everyone envies, both very aware of how lucky they got.
At some point they maybe visit Hana's hometown. Hana is super proud of her amazing hardworking husband who is an ENGINEER and taught her to READ AND WRITE and who is a good and honest man who doesn't run after whores or gamble or drink (unlike a lot of men she knows in the village, by the way). Her family is shocked and a little horrified at first because that's an orc, Hana. Hana defiantly gives zero shits. Hot orc is flattered and even more enamored.
This last bit can also just be in letters Hana writes home. Or maybe he family visits them, not having figured out the amazing husband is an orc.
Idk, I just love the idea that out of all the couples in this story, the one lightning-from-the-heavens match made in heaven romance would be between a stiff prude awkward human and a huge orc "savage".