[X] Datu deserves the lamp. He saved you from getting made into its new registered master, whatever that means (nothing good), made the throw that blew up the marid, and is your brand new boyfriend whom you may have to live with very soon. On the other hand it wasa team effort, and if he gets the lamp that potentially means bringing it back to your lair and you really don't want to see that thing again as long as you live.
[x] Tala deserves the lamp. She destroyed the armoured elementals, used her unique powers to set up the killing throw for Datu, and is your brand new boyfriend's sister so maybe you shouldn't antagonise her the very first time you meet her. More to the point, if she gets the lamp you'll probably never have to see it again. On the other hand, immediately siding with his sister over him may not be the best way to kick off a relationship with Datu.
[X] "There's no way in hell I'm letting that tainted lamp back into my lair, particularly considering there's already another Djinn there that I'm... apparently registered to."
[X] Propose that they both accompany you back to your cavehomeshagpaddomicile, where your personal djinn and wizard (boyfriends) can have a look at maybe getting it all de-eviled.