oh man so when kakashi was on guard duty for 9 months (not 10, kishimoto, there’s…. literally no way a baby will stay in for 10 months literally just ask any sane doctor) (but they totally did it on the hokage desk and kurama grumbled about it, and thats how they found out kushina was pregnant. built in pregnancy test kurama)
….. when kakashi was on anbu guard duty for 9 months while kushina was pregnant, u know kushina dragged him inside to teach him abt sealing techniques. she’s a high-energy ninja on near-house arrest, all because she’s growin a lil squirt inside her belly, and yeah she gets the pregnancy tired but she’s still cooped up and bored out of her head with no missions. so she takes on a new mission: minato’s depressed last-of-his-team kiddo.
she makes up weird cravings that turn out to be really good– pickles and eggs, pickles and ice cream, ramen with saury, idk sry. when he brings her the right food from the right vendor (she sends him back 3x lol) she drags him inside and makes him eat w her while she “"pretends”“ to study her sealing notes. it’s pretty obvious what she’s doing, but kakashi’s like, super duper depressed so it takes him a lil bit to catch on that she just wants to teach him something so she’s not bored. (he never catches on that he’s her mission lol.)
so kushina passes on down what’s left of the uzumaki & uzushio sealing techniques she can, over pickles and ramen and saury and eggs, and varying combinations of the food.
how else did y'all think minato became so good with sealing? sure he’s a quick study– but kushina gave him that extra insight, and kakashi used her knowledge during anbu to help keep himself alive. (sealing scrolls for various weather on mission, plus the insight about pocket dimensions helped him later on when he was training with kamui.)