Might this be inspired in part by Shiden Akira's classic work: "Tiny Boobs Giant Tits History"? ... answer needed for (*cough, cough*) "research purposes".
Breast milk confirmed cure for ED?
I mean it's good that he got a problem like that fixed...er, naturally. It almost feels in a way that he's just taking advantage of her kindness in helping him, not that she's really resisting or anything.
That ending though. Well...Until he comes back, but that's plenty time for him, I'd think.
I also bet the fact that she belongs to another man also helped him.