I used to use trucrypt on a folder that was store on dropbox, TrueCrypt is not safe, VeraCrypt is an alternative and there is a portable version available on portable apps.
I would create an encrypted folder on the drive and install the portable version of the app, so you can access it.
Personally I wouldn't use bitlocker. You can crack the protection if you have access to the drive (Physical). Veracrypt is a much better option, it's also open source.
Also depends how worried you are about people getting hold of your dick pics tbf.