In a LTR and bored?
I suggest you invite another couple over and make out with your lover in the same room.
Both of you make out and glance at each other.
You do not have to touch the other couple if you are in a strict buried relationship.
Gives you both something to talk about and maybe learn lots!
About the time of my third and last LTR, my partner Steve and I did this often (we had a hot tub out back on the deck) and it’s nice when your comfortable and secure enough with each other so that there’s no jealousy issues or head games to deal with.