Not being smug - DS is only 13 and i've read a lot of threads by parents of 15 year olds etc saying 'he was lovely at 13'
But just to remind myself, one day in the future when he's being a pain, of just how nice teenagers can be.
He no longer needs me to wipe his arse, entertain him 24/7 or prevent him from certain death every 2 minutes.
He's not cuddly exactly but if we are both sitting on the settee he will drape his legs over mine, and he still will tolerate wants a goodnight kiss before he goes up.
He will ask us how we are and if we had a good day sometimes
He is starting to do his chores without being constantly nagged.
Ditto homework - he may do the absolute minimum but he DOES it.
He's a good friend and has some good mates he does nice things with.
He doesn't seem to be particularly into romance yet so there is no huge drama.
He's quite good at being polite and basic social niceties for a short time.
He loves his screen time and is no doubt watching all sorts of stuff we'd rather he didn't but it's really great when he shows us some stupid joke or other and we all have a giggle.
He's rather paternal about me and will check I have my keys and phone before leaving the house 
Tell me nice things your teenager does 