Making up stories on vacation, mostly all the same: mention work on return (11)

'making up stories' is the definition.
I can't tell whether this defines the answer.

'vacation mostly all the same mention work on return' is the wordplay.
'vacation mostly' becomes 'my' (I can't explain this - if you can you should give a lot more credence to this answer).
'all the same' becomes 'tho' (I've seen this before).
'mention' becomes 'cite' (to cite is to mention or quote).
'work' becomes 'op' (abbreviation for opus).
'on return' shows that the letters should be reversed in order.
'cite'+'op'='citeop'
'citeop' reversed gives 'poetic'.
'my'+'tho'+'poetic'='MYTHOPOETIC'

'on' acts as a link.

Can you help me to learn more?