UC and unusual living situation

hi, I've just got my ESA-UC migration letter, and I've been reading your pdf on the migration process but I have a question:

I live in a housing association flat, and I have a friend living with me long term (in my living room!) because they got kicked out of their previous place - we're both disabled and chronically ill, we're both wheelchair users, we're both getting PIP but I'm the only one on ESA and HBEN.

I pay the rent (I'm the one on the lease, I get my rent through HBEN), my friend contributes to house bills, we buy our food separately because we have weird diets

is this going to be complicated when it comes to filling in the UC migration forms? do I literally just declare them as a long term guest or what? our long term plan is to get wheelchair accessible housing for both of us but the system is very weird when you're not a couple (plus there's very little housing that allows for the shocking idea of two wheelchair users living together who aren't a couple) so we'll probably wait for years *rolls eyes*

thank you, that's really helpful