Ah yes, the "slow" sexual corruption of Hina (equally on par to Thirsty Kuru but in different directions but similarly towards their beloved hubby)
Hina JK days: E-eh?! Your, oc- groin is getting b-big, what do I do?!
Hina-"mama" days: Eh? Your ochinchingroin is rising again and you want me to "heal" it? Fine, just once okay?
And so they did, probably more than just "once"