Hey there Cocodille!
To write this email, you need:
- Title
- Initiation
- Main section
- Ending
The title can be anything, ''Thank you'', ''Great visit!", ...
Then, you continue with the initiation.
''Dear,..... It's me,...! Yesterday/Last week we have got a great time together..."
And also don't forget about what you were happy with, what do you like in that time, (can be truth or fantasy :))
"I remember we've done.... It was so cool/awesome/fun.... We ate...., played....."
In the main part, you write about the future, what are you planning to do.
" I have been at your lovely home, so maybe you want to come to my house too? I'm free on Monday/Friday/Sunday.... I have a lot of candies/games/CD we can play, eat, watch,.... I hope you will be there with me..."
For the ending, you send best wishes to your friend and sign your name
"Thank you for that valuable time with you... Hug/Bisou/Love... Cocodille"
J'espere que ce t'aide! ;D