Haremtrix

The Haremtrix was basically identical to the prime timeline's Omnitrix, save for a few functions. Most of them connected to the Harem Function. It was use the user's attraction to member of their desire sex, to plant a Trix Seed in them with a teleportation function. Undetectable by all but the most advance scanning technology, the seed would sit in readiness for a certain trigger element even as it influenced the seeded with tech based on the Psycholeoterran. But instead of being an illusion of the victim's desires, it affected the seeded's desire. For the Haremtrix user and their fellow seeded.

The trigger was once the Haremtrix user turned to the age of majority, eighteen for humans, the seeds would blossom into their own Omnitrixes. If the Haremtrix was the master 'Trix, these were sub-networks of 'Trixes that were subjective to the original.

And so Ben Tennyson having the Omnitrix off and on for eight years, finally become an adult. And a number of women wake up with an Omnitrix and certain feelings for our hero.