Hi.my bf and I will be staying in Hong Kong for 3 days.

I'm planning to buy the airport express and mtr travel pass. Can it by used by two person or 1 for each? In case that we only need to buy 1 for the both of us, i need to buy the 2 single journey AE and mtr octopus card? So that the both of us is covered for the AE ride? Thank you!