dys - I think the old fashioned way would be best.
Buy an attractive journal, or have someone buy one for you.
Make it one that lady diane will have reason to know where it is kept.
Write down any passwords, and other information in the back of it, and present it to her as a gift, with a kiss.
While u both can,
u might take some time to discuss
each of your respective biographies,
so that eventually, when one of u can 't,
there is less likelihood of permanent curiosity in the survivor.
Talk about what was good n bad in each of your lives,
and any way to improve it.