Console cross and upset old boy with kiss (4)

'kiss' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'console cross and upset old boy' is the wordplay.
'console' becomes 'x' (I can't explain this - if you can you should give a lot more credence to this answer).
'cross' becomes 'x' (an X is a cross).
'and' means one lot of letters go next to another.
'upset' says the letters should be written in reverse.
'old boy' becomes 'OB' (abbreviation for a private school 'old boy').
'ob' in reverse letter order is 'bo'.
'x' put after 'bo' is 'box'.
'x'+'box'='XBOX'

'with' is the link.

Can you help me to learn more?