1. Certain items of clothing will migrate across the hallway permanently.
2. You'll run out of underwear because you haven't done washing in three weeks and just borrow theirs without asking.
3. You'll end up seeing each other naked all the time.
4. You'll hear them have sex.
5. You'll never be more than a couple of hours behind in what's happening with their love life.
6. And you'll be there to pick up the pieces when it all goes wrong.
7. You'll talk about bodily functions a lot.
8. You'll shout from the toilet that you're having a toilet roll emergency and they will rescue you in your hour of need.
9. You'll start cleaning up the house and an hour later you'll just be dancing in a fit of giggles.
10. But when one of your parents comes to visit, you'll both get down to work to make the place presentable.
11. Every time you try to do any work at home they'll distract you.
12. You start arriving to all events together.
13. You'll develop a special look for when you're out together and it's time to leave.
14. You've also cancelled going out just to stay in together.
15. At some point one of you will come home wasted and the other person will become their carer.
16. You'll see each other in your most gross state.
17. You will have several cooking disasters, but they will all end up with you crying with laughter.
18. You'll have an argument because someone watched the new episode of your favourite show without the other one.
19. Instead of passive aggressive notes you'll leave cute notes around the house for each other.
20. And left over food.
21. You'll stay up way too late talking about practically nothing.
22. And you'll spend a lot of time hanging out in complete silence feeling totally comfortable.
