>> Are we still talking about OAV? I don't recall Keiichi saying that...
>> Of course, I might remember incorrectly.
>> 
>"Here.  It's hot."
>
Oh, that one. But he just warns Belldandy not to burn her mouth.
In OAV Keiichi doesn't say "This will keep you warm". I don't know if he
says so in manga. If I have understood correctly, anime is based (loosely)
on a manga storyline.