Tom and his boyfriend Jax are both into Vore... Vore is a fetish involving being eaten by or eating someone or something, real or imaginary. Jax wants to be the eatee and Tom the eater.
Think of the words lessee/lessor.
A lessee is a person who leases something from a lessor. A Lessor is the owner of property that is leased.
The phrase ‘have you eaten rice yet?’ is a social pleasantry used between friends and acquaintances along the same lines as saying ‘how are you?’ or ‘how’s it going?’ A person may respond, ‘eaten already’ or ‘not yet’. The phrase is another way of asking ‘have you eaten yet?’, but if the reply is ‘not yet’ there is every chance the two friendswill end up eating together even if it’s just a quick snack.
Boy: Have you eaten rice yet? (Typical greeting)
Girl: Yes, I’ve eaten. (Expected reply)
Boy: Where are you going? (The standard opening)
Girl: Over there! (Reply)
(Also a greeting couched like a question that requires no answer.)