New fantasies and experiences are mandatory to kill the routine, routine is killing love and passions.
Pegging your hubby is like as you two searching your way in a labyrinth, just one difference for the labyrinth you try to escape, for pegging you try to enter and offer the pleasure of the entry of this new world of feelings for him.
Go slow, go lubed, BOTH be patient, never enter slowly, progressively in one move, always move in and out, and each time a few deeper, lube, lube and tease, lube and suck his penis, and if he is ejaculating before to be pegged, it is a victory for you, you are a love goddess, you sure he will ask you for more.
This is a game in one direction, he asked you a fantasy, you must ask him a fantasy for you, it is like a reply to a personnal and confidential message, a fantasies exchange is a rule and must be existing / shared.
Good lubes are - K Y - J Lube - and " teat cream " easy to found in Belgium, I son't know in the US.