[header] How to sleep at your boyfriend's house for the first time [title] Choose a discreet bag. [step] You don't want to seem like you've prepared to move in for a week; but you'll likely want a few essentials to make the morning after easier. You'll also want to be able to brush your teeth and remove any makeup if you wear it.
[substeps] See what you can fit in whatever bag you usually carry with you. If you normally carry a very small clutch or wallet, you'll need to bring something slightly bigger or only pack the bare essentials.