Love note book

Here is a fun idea to last more than a night.  Get a cheep note book from the store and designate it your "Love note book".  Get something you will both recognize as " The book".   One of you will start by writing a note, a poem or drawing a picture.  Put the notebook somewhere your lover is sure to see it.   On or under there pillow is always a good spot.  They get to open and read the message, then take their turn and do the same for you.  Notes don't have to be written back right away.  Sometimes it is really fun and really rewarding to put a lot of time and thought in to it.   Day's or weeks can go before the notebook turns up.  This way it is a fun surprise when you get it.
If you keep the fun going for a while you will end up with a cherished memento of your love.
To give you an Idea...
One of the entries in "Our" love book is a picture of some birds sitting in a tree. I wrote.. " I'm glad we built our nest together"