He's not marking it, he's just urinating on it.

14 weeks is waaaaaay too young for it to be marking. They don't mark until they hit sexual maturity, and thats usually over 6 months. If you get him neutered before he hits sexual maturity and he is reliably housebroken, you won't have issues with him marking in the house.

He simply sees that bed as a good place to relieve himself. Take the bed, wash it good, and then stash it in a closet for a while and work on training him to potty outside. After a month or 2, when he's going potty outside reliably and hasn't had an accident in a while, then you can try introducing the bed again. In the mean time, he'll be fine sleeping on the floor or where ever he was sleeping before you got the bed.