My thoughts exactly.Last Page : Perfect Motorboating Height !!
Though i don't think it will be that bad (but you never now since, manga) but there will most certainly be a plot point about her being dependent on him like a lost kitten socially and emotionally so he might postpone any progress till she can stand on her own feet properly.In b4 'I need to become worthy of Onee-san and cut contact for a year'-trope.