You don't know who to tag or how to build CR? Just use the Generator! It picks two characters yours can gain Character Relationships with and even a location!
Want to take it ever further? Have some fun with the generator and just get a random pairing and location and write in a comment how you think that kind of situation could happen/what would be said/what would be the outcome/etc. Enjoy!
Thank for you time. Please return to your regular late night programming.