The feelings of lust were converted into lust mana.
This lust mana coursed through Eren's body without affecting his mind again. It was as if he was in complete control of this lust mana because it was his own and not something he had summoned from the Sin Plane with the help of his Sin Series Mark.
Eren didn't know how the lust mana he had created would differ from the usual lust mana he was used to employing. But he figured that the applications of this type of lust mana would be the same as regular mana. If he had to guess, it would be the output of the applications that would differ depending upon which brand of mana he was using at the time.
However, Eren kept those thoughts aside and focused on his current task by looking into Levine's moist eyes. He also retained the lust mana he had created and didn't let it disperse through his system. After all, this was not the time to experiment with a completely different field of magic that had been opened up for him.