While I do think it should be easier and give you more opportunities to offer your neck up, the option you listed is actually the 2nd chance you get in that conversation - to choose the option you did means skipping the first opportunity.
I guess #4 does read as inappropriate since "I need to know how we're going to feed you in the future" steers the conversation away from him biting *you*, so to drive it back to suggesting he bite you you'd need to derail it a second time which it sounds like you were avoiding? I just responded positively the first time and it locked it in.
When he says "Unless you were looking for another nibble..."
I just said "Maybe later?" And that opened up nightly invites to bites.
It seemed pretty straight-forward to me.
Unfortunately it's also a much shorter conversation so I ended up with less dialog, but same results.
Having the opportunity open up again would be nice though.